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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class DMSDocumentCartSubmission extends DataObject  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $db = array(  | 
            
                            
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                        'ReceiverName'            => 'Varchar(100)',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'ReceiverPhone'           => 'Varchar(20)',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'ReceiverEmail'           => 'Varchar(254)',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'DeliveryAddressLine1'    => 'Varchar(200)',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'DeliveryAddressLine2'    => 'Varchar(200)',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'DeliveryAddressCountry'  => 'Varchar(50)',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'DeliveryAddressPostCode' => 'Varchar(20)',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $has_many = array(  | 
            
                            
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                        'Items' => 'DMSDocumentCartSubmissionItem',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $summary_fields = array(  | 
            
                            
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                        'ReceiverName' => 'Receiver Name',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'ReceiverPhone' => 'Receiver Phone',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'ReceiverEmail' => 'Receiver Email',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'Items.Count' => 'No. Items'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $singular_name = 'Cart Submission';  | 
            
                            
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                    private static $plural_name = 'Cart Submissions';  | 
            
                            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Removing the add and existing GridField components to ensure that the model admin for submissions doesn't  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * let you add new records  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return FieldList  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public function getCMSFields()  | 
            
            
                                                        
            
                                    
            
            
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                        $fields = parent::getCMSFields();  | 
            
            
                                                        
            
                                    
            
            
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                        $gridField = GridField::create('Items', null, $this->Items(), $config = new GridFieldConfig_RecordEditor); | 
            
                            
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                        $fields->addFieldToTab('Root.Items', $gridField); | 
            
            
                                                        
            
                                    
            
            
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                        foreach (array('GridFieldAddExistingAutocompleter', 'GridFieldAddNewButton') as $component) { | 
            
            
                                                        
            
                                    
            
            
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                            $config->removeComponentsByType($component);  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        return $fields;  | 
            
            
                                                        
            
                                    
            
            
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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.