Sorry, we're still having trouble replicating this issue. Do you receive the same error message when sending a cURL request? If so, could you please send us the cURL request that you've used?
Also, if you could send us the logs produced by the Gateway, that would help a great deal as well. You should be able to obtain your logs with the following command in Ubuntu (the exact location of your logs may vary slightly depending on your OS):
sudo tail -f /var/log/upstart/tyk-gateway.log
Jess @ Tyk