http status 400 - bad request

"HTTP Status 400" error on app start link

I'm trying to make a link from my application homepage to start my process:

/bonita/portal/resource/process/PracticePool/2.0/content/?id="+processDef[0].id

Where PracticePool version 2.0 is my pool. Also, my current process definition looks like:

../API/bpm/process?p=0&c=1&f=name=PracticePool

However, whenever I try to use the link in my portal application homepage, I get an "HTTP Status 400 - Bad Request" error - specifically:

Type: Exception Report

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