Difficulty converting to xls online

Dear community members, i have been battling for the past three weeks to convert my online form using the xls online application. I keep getting this message anytime i try to convert the form "502 Bad Gate way, nginx/1.10.3 (Ubuntu)". I have tried different computers and browsers but still no progress and time is actually catching up on me, any solution?

See the solution at 502 Bad Gateway error while using the XLSForm online

Hi All,
I have faced the same problem, when I use offline convertor works well. Of course my intension was to get the preview PDF document, for attaching on the report, Anyone who has managed to trigger this problem