When you tap the Back button or try to reopen the app, you continue to see the same error. You may see the sign in page before you encounter the error again. The issue only occurs for users in child business units with security roles inherited from a parent business unit.
Microsoft is aware of this issue and plans to provide a fix in a future update. The issue has already been resolved in Microsoft Dynamics CRM Online and a fix is planned for Microsoft Dynamics CRM 2013 on-premises. In the meantime the workaround from the Resolution section can be applied.
1. Log into the Microsoft Dynamics CRM web application with a user that has the System Administrator security role.
2. From the navigation bar click Microsoft Dynamics CRM and then click Settings.
3. From the navigation bar click Settings and then click Administration.
4. Open the security role (at the parent business unit level) assigned to the user who encounters this issue.
5. Without making any changes, click the Save button.
6. Click the File menu and then click Properties.
7. Verify the Last Modified On date has been updated.
8. Close the window for the security role.
Note: Within the Security Roles sub-area you can click the Business Unit drop-down list to display roles for each business unit. If you check the role at the child business unit level, you should see that the Last Modified On date is now populated.
9. Repeat steps 4-8 for any additional security roles that are encountering this issue.
10. Verify that the issue has been resolved.
Note: Because the default System Administrator role cannot be modified, there is not currently a workaround for users in child business units that have the System Administrator role. A copied version of the System Administrator role (created using the Copy Role feature) can be modified.
Error Message:System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.Crm.Application.WebServices.ApplicationMetadataService.<>c__DisplayClass30.<UserRolesChanged>b__2d(Entity role)
at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source, Func`2 predicate)
at Microsoft.Crm.Application.WebServices.ApplicationMetadataService.UserRolesChanged(Guid clientUserRoles, DateTime syncTime, ExecutionContext context)
at Microsoft.Crm.Application.WebServices.ApplicationMetadataService.RetrieveUserContext(UserContextRetrieveRequest userContextRetrieveRequest)
For information on how to enable tracing in CRM for Tablets, refer to the following article:
Enable tracing in CRM for tablets