If you use the older version of the mobile app, please delete and download the latest version from the app store. 
 * Only PowerSchool Mobile App version 22.5.x and higher is supported for use with PowerSchool and above.
* PowerSchool Mobile App versions older than 22.5.x will generate an error when attempting to connect to PowerSchool and higher. 
In addition, if you are using Ecollect to view forms, the PowerSchool Mobile App must be upgraded to the same version of PowerSchool SIS "