Hello, please I need your help with "did you forget to inherit a required module"

Dear all: 

When I running my GWT app, I have the following error :

No source code is available for type java.security.SecureRandom; did you forget to inherit a required module.

This error occurs after include a security class, http://www.mindrot.org/projects/jBCrypt/

I read a lot of different solution however I can't find the solution.

Thank a lot guys, Your help will be very appreciate.

Nicolas.

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