Flex Builder 2.0.1 is out but not without glitches

If you've tried to import or use your old (from 2.0) Flex Library project with 2.0.1 and experience crashes mostly likely the cause of the problem is dependency on the additional library.

For example if you created folder inside of Flex Library Project, then copied some 3rd party library there and linked the library to your project almost immediately Flex Builder may crash with the following not so helpful message:

One way to avoid the problem is to move the folder outside of the project.