Won't complete - error

[rugbygis]

When I run the checker it throws an error:
2019-10-23T15:17:13 WARNING warning:C:\OSGEO4~1\apps\Python37\lib\site-packages\PyQt5\uic\objcreator.py:152: DeprecationWarning:

         'U' mode is deprecated
         
         
         traceback: File "C:/Users/removed for security/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\ConstraintChecker\constraintchecker.py", line 136, in checkExistingGeometry
          self.constraintCheck(geom, epsg)
          File "C:/Users/removed for security/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\ConstraintChecker\constraintchecker.py", line 149, in constraintCheck
          refDlg = ReferenceNumberDialog()
          File "C:/Users/removed for security/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\ConstraintChecker\reference_number_dialog.py", line 36, in __init__
          self.ui = uic.loadUi(ui_file, self)
          File "C:\OSGEO4~1\apps\Python37\lib\site-packages\PyQt5\uic\__init__.py", line 226, in loadUi
          return DynamicUILoader(package).loadUi(uifile, baseinstance, resource_suffix)
          File "C:\OSGEO4~1\apps\Python37\lib\site-packages\PyQt5\uic\Loader\loader.py", line 51, in __init__
          UIParser.__init__(self, QtCore, QtGui, QtWidgets, LoaderCreatorPolicy(package))
          File "C:\OSGEO4~1\apps\Python37\lib\site-packages\PyQt5\uic\uiparser.py", line 177, in __init__
          self.factory = QObjectCreator(creatorPolicy)
          File "C:\OSGEO4~1\apps\Python37\lib\site-packages\PyQt5\uic\objcreator.py", line 85, in __init__
          if self.load_plugin(filename, plugin_globals, plugin_locals):
          File "C:\OSGEO4~1\apps\Python37\lib\site-packages\PyQt5\uic\objcreator.py", line 152, in load_plugin
          plugin = open(filename, 'rU')