Failed To open MDB/XXX

Hi..
I was working in design module without any problem. But suddenly it is showing FAILED TO OPEN MDB / xxx - SWITCH TO MONITOR for opening design module.
Pls advise why this problem is occurring. And how to fix it.

Thanks I'm advance.

Regards
Anil Kumar

Hi..
I was working in design module without any problem. But suddenly it is showing FAILED TO OPEN MDB / xxx - SWITCH TO MONITOR for opening design module.
Pls advise why this problem is occurring. And how to fix it.

Thanks I'm advance.

Regards
Anil Kumar