Error when importing data

[WanderingMoose]

I have created an import file (CSV) using the help page on this site and can not import the data.

After selecting the file to import after say 15-30 second I get the following error message.

Error 503 Service Unavailable
Service Unavailable
Guru Meditation:
XID: 795046530
Varnish cache server

Any help would be appreciated since I would like to track all my vehicles on Fuelly.