Symptom
While in the Apps node, users encounter a message reporting that an error occurred when loading the database role from a file.
Resolution
The error is coming from Analysis Services. SSAS depends on the file system and, for some reason, the files get corrupted on a regular basis. Restart the SSAS server and then re-deploy the Application. If that doesn’t solve the issue, install the latest cumulative update (CU) of SQL.