[news.eclipse.technology.iam] Could not delete target/test-classes

[nicolas.deloof@xxxxxxxxx (nicolas de loof)]

Hi

I've just installed iam on Galileo and get this strange error :

The project was not built due to "Could not delete 
'/infrastructure/target/test-classes/com'.". Fix the problem, then try 
refreshing this project and building it since it may be inconsistent

Running Eclispe clean, maven clean goal, or manually deleting this folder 
has no effect, I always fail with this error status.

Any idea ?