Error: The class"timeObj" is undefined. Perhaps Java is not running

So I have a timer in my script. The script worked fine up 'til yesterday, now I get this error:

Error while evaluating TimerFcn for timer 'timer-8'

The class "timerObj" is undefined. Perhaps Java is not running

I dont think I have changed anything to cause this, but just in case I have tried going back to previous version of my script and they all behave as this now. I cant figure out what is wrong.

Can someone explain what this error could mean, and what might be the problem.

I am using Matlab 2011b.

Thanks

[per isakson]

What is the value of TimerFcn? Put a breakpoint at the first line of whatever TimerFcn is.