Mobile App Does Not Work With Vtiger 7.0.1

I have loaded the Vtiger Mobile app from the Android play store. I can login successfully with the app. When I click synchronise I can see the web server responding by observng the vtigercrm/logs/vtigercrm.log file output. However once synchronised the menu for each module displays an black screen (empty list). i.e there are no records displayed. When I cick on add to add a lead or opportunity or to add any record to any module I get a black screen. The form is not displayed. I am using Android 6.0.