Traceback (most recent call last): File "/opt/ApMeFo/ui/appFolders.py", line 169, in on_btnUpdate_released self.mainApp.foldercontent.updateFolder() File "/opt/ApMeFo/classes/folderContent.py", line 63, in updateFolder includeNode = self.xmlTree.getElementsByTagName("Include")[0] AttributeError: 'NoneType' object has no attribute 'getElementsByTagName'