Cannot debug Call Studio application randomly....

I have a CVP project in Call Studio with 10.5, before I can use debug, but right now if I try to debug the same program again, I get following message:

I don't know where cause this issue and there is no way to find out the log for this issue...

And also invoke some side effect too, like if you try to validate, it didn't tell you does validation success or not. Or if you try to deploy,  just run the progress bar, but no file generated.

It could be an custom code issue. To check the logs following locations will be helpful.

For Browser Logs:

C:\cisco\CallStudio\eclipse\plugins\com.audiumcorp.studio.debug.runtime\VOICE_BROWSER_HOME\logs

For VXML Server Deployment related logs:

C:\cisco\CallStudio\eclipse\plugins\com.audiumcorp.studio.debug.runtime\AUDIUM_HOME\logs

Also, try rebooting or restarting Studio.