at Request.Emitter.emitat ... XMLHttpRequest.xhr.onreadystatechange

i am working with node.js and in one part of my app i try to upload one file .xlsx and save the dates in the BD. I use RethinkDB for create de databases. The functionality is ok when i make the local test but when deploy an AWS I get this error in the console

Error: Internal Server Error at Request.<anonymous> 
(http://evermetric.co/app.js:18548:19) at Request.Emitter.emit (http://evermetric.co/app.js:2048:20) at XMLHttpRequest.xhr.onreadystatechange (http://evermetric.co/app.js:18850:10)

I hope that can you help me. thanks

via William Serna