IDE error loading project.

I've just loaded the IDE first time today and loaded a small project that worked yesterday and got a message box

Title - Basic4android

An Error occurred.
Collection was modified; enumeration operation may not execute

Click to expand...

I saved the source without modifying it
File -> Save
Did File -> New
Did File -> Select the project name

And it loaded and ran fine.

Cross thread timing problem?

Cross thread timing problem?

Click to expand...

Most probably.

Do you often see this error? If yes, then you can run the IDE with logging enabled and then find the stack trace. It will be very useful.