Weir error message submitting a job

prepared an expe: https://www.beat-eu.org/platform/experiments/setup/smarcel/tpereira/full_isv_multi/2/Perio_CPqD_T-MM_D-MM_T-MM_ISV-G512-U160/

pressed "GO" to submit then got the HTML error message in a pop-up:

504 Gateway Time-out

504 Gateway Time-out

---

nginx/1.2.1 --

then still on the expe page https://www.beat-eu.org/platform/experiments/setup/smarcel/tpereira/full_isv_multi/2/Perio_CPqD_T-MM_D-MM_T-MM_ISV-G512-U160/

where I can press "GO" again

however the jobs seems running: https://www.beat-eu.org/platform/experiments/smarcel/tpereira/full_isv_multi/2/Perio_BANCA_T-P_D-P_T-P_ISV-G512-U160/

so I didn't pressed "GO" again to avoid messing up