Can not build extensiomn using Extensio

Hi,

I am building extension using Flash Builder 4.6 and extension builder 2.1. Compilation job is done corrcetly by FB but extension builder is throwing the error as given below.

Errors running builder 'Adobe Creative Suite Extension Builder' on project 'AppStudioExporter'.

Please log in with your Adobe ID to use Adobe Creative Suite Extension Builder.

I am using correct credentials, still facing the issue.

any idea what mistake i am doing.