Repo V3 Error

Hi,
Can you please give me a resolution to this error:

com.wm.bpm.persist.RepoSessionException: RepoV3 error: com.wm.bpm.persist.RepoSessionException: RepoV3 error: com.wm.bpm.persist.RepoSessionException: RepoV3 error: com.wm.bpm.persist.RepoException

I am getting this error when i log into modeler.
Please tell me why i am facing this error.

Thanks in advance

What version of modeler and database are you using?