cronjob not being run

This should be pretty simple, I want to have a basic cronjob going. Here's the file I used:

0 0,3,6,9,12,15,18,21 * * * (cd /home/jboss/runnerapp; ./run.sh)

I want it to run run.sh every 3 hours, every day. For some reason it's not being run at all. I know the command is fine, I've just copied and pasted it and it runs, and my crobjob is at least loading correctly, because shows all that. So I guess there's something wrong with how I setup my cronfile? Hope someone can help me out. Thanks

 

 

 

 

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