OCI call for connection failed

Hi experts,

I establish connection in Designer successfully  even I can view metadata of that particular data store, but when I run the Job got this error:

28055    2398267120         CON-120404       10/29/2015 2:17:55 AM  OCI call <OCIServerAttach> for connection <SRCTST> failed: <*****>. This message contains some internal system details which

28055    2398267120         CON-120404       10/29/2015 2:17:55 AM  have been hidden for security. If you need to see the full contents of the original message, ask your administrator to assign

28055    2398267120         CON-120404       10/29/2015 2:17:55 AM  additional privileges to your account.

Please suggest me I need to run the jobs asap.

Thanks

Murali