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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use nkostadinov\taxonomy\models\TaxonomyDef;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use nkostadinov\taxonomy\models\TaxonomyTerms;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use yii\db\Migration;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class m151031_160731_taxonomy extends Migration  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getTableOptions()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->db->driverName === 'mysql') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            // http://stackoverflow.com/questions/766809/whats-the-difference-between-utf8-general-ci-and-utf8-unicode-ci  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return 'CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE=InnoDB';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new Exception('Unsupported database.'); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function up()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->createTable(TaxonomyDef::tableName(), [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'id' => $this->primaryKey(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'name' => $this->string()->notNull()->unique(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'class' => $this->string()->notNull(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'created_at' => $this->timestamp(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'total_count' => $this->bigInteger()->defaultValue(0),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'data_table' => $this->string()->notNull(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'ref_table' => $this->string()->notNull(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'migration' => $this->string()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ], $this->getTableOptions());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->createTable(TaxonomyTerms::tableName(), [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'id' => $this->bigPrimaryKey(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'taxonomy_id' => $this->integer()->notNull(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'term' => $this->string(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'total_count' => $this->bigInteger()->defaultValue(0),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'parent_id' => $this->bigInteger(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ], $this->getTableOptions());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->db->driverName === 'mysql') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->addForeignKey('fk_TaxonomyTerm_Taxonomy', TaxonomyTerms::tableName(), 'taxonomy_id', | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                TaxonomyDef::tableName(), 'id');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function down()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->dropTable(TaxonomyTerms::tableName());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->dropTable(TaxonomyDef::tableName());  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.