UICParser class (pyside2uic/uicparser.py:640) throws an AttributeError when it tries to reference self.column_counter. This attribute is set in the createWidget method, however, this has apparently not yet been called when the attribute is referenced.
Adding self.column_counter = 0 in UICParser._init_ fixes the problem.
- relates to
PYSIDE-797 Rewrite pyside-uic