Definition could not be found - but library is there!

Hi,

I installed a library (as3isolib) in Flash Builder 4 and started writing code (following a Lee Brimelow's tutorial on www.gotoandlearn.com).

So, if I instantiate a new variable, the hint box is there with all the classes and methods and all. After inserting the line, the corresponding import line is also inserted automaticaly.

I believe this means the library has been added correctly to the project.

HOWEVER... the editor reports error messages all along the code biside all references to the library classes.

The very first error message on the code is "1172: Definition as3isolib.display.IsoView (for instance) could not be found".

I don't get it... Any ideas?

Thank you!

Marcos