Below are some of the steps to do a check -
1. Check if SQL Database server is up and you are able to connect.
2. Try to start the Essbase studio from the below path MIDDLEWARE_HOME/user_projects/epmsystem1BPMS/bpms1/bin
3. after essbase studio is running , run
cpl reinit command
and try again to see if you are facing errors.
let us know and try to explain us more about issue so that someone from forum will surely help you to resolve asap.