Traceback (most recent call last):
  File "C:/Users/Phil/.qgis2/python/pluginsraster_transparencyrastertransparency.py",     line 152, in layerChanged
    self.dockWidget.updateSliders(maxValue, minValue)
  File     "C:/Users/Phil/.qgis2/python/pluginsraster_transparencyrastertransparencydockwidget.py",     line 141, in updateSliders
    self.spinStart.setMaximum(int(self.maxVal))
TypeError: QSpinBox.setMaximum(int): argument 1 has unexpected type 'long'