I initially was starting the appropriate resque tasks manually on the server and got the error. I changed the deployment strategy and ended up adding the resque task in the capistrano recipe...and it worked! Another mystery solved.
I guess the explanation is a mix of not being in the same rails context and user privileges.
You are probably missing the RAILS_ENV environment variable and Resque tries to use development database (which is not existing). This should work if you run the rake from the command line.
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