In OSB some times when we are going to activate a session we will get this error.
Error –> Another session operation is in progress , please try later.
Solution –> For resolving this issue we need to go to view sessions of change center and discard all changes .
If this does not resolve the issue , please try the below option .
Shutdown the Admin and OSB servers.
Clear all the session folders in “$domain-home/osb/config/sessions
And then restart the servers .