Added the user with full rights. Still the same error while deploying report. Earlier AX was not opening on because of changed SID. I had to update sid in db.usersinfo table of MicrosoftDynamicsAX database. Do you think it's the same SID issue with Reporting database as well?
The error I'm getting while trying to open the report:
Failed to load expression host assembly. Details: Could not load file or assembly 'Microsoft.Dynamics.Framework.Metadata.AX, Version=6.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. (rsErrorLoadingExprHostAssembly)