RabbitMQ-Plugin causes compilation-error in IDEA

After installing the RabbitMQ-plugin into an existing Project I get this, while compilation when I try to start the project via IDEA:

/usr/local/idea/.IntelliJIdea90/system/compiler/goportal.goPortal9d53a13d/.generated/groovyStubs/goPortal9d53a13d/goPortal-grailsPlugins/production/org/grails/rabbitmq/GrailsRabbitAdmin.java
cannot find symbol class RabbitAdmin
cannot find symbol class ConnectionFactory


Since running the project from the console works pretty fine I guess it has something to do with the IDE.

Any ideas?

Cheers

Edit:
IDEA 9.0.3
Build# 95.429

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