The trait Migratio\GrammarStructure\Mysql\Traits\QueryStack requires the property $schema which is not provided by Migratio\GrammarStructure\Mysql\QueryBase.
The method getConnection() does not exist on Migratio\GrammarStructure\Mysql\QueryBase. Maybe you want to declare this class abstract?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
The expression return $this returns the type Migratio\GrammarStructure\Mysql\QueryBase which is incompatible with the documented return type Migratio\Contract\ColumnsProcessContract.