The API module detected a conflict between application priority and version. Application Uri: '%1' Cause: The application ...

The API module detected a conflict between application priority and version.

Application Uri: '%1'
Cause: The application is registered with a priority that is higher than the UserServices module. However its application version or its manifest configuration does not permit having a higher priority than the UserServices module. This may cause errors in message routing.
Resolution:
This warning may appear if you recently made changes to the application list or installed a new application. Check the application list using Get-CSServerApplication PowerShell cmdlet and ensure that the order of the application is correct.