sendfile() failed (32: Broken pipe) while sending request to upstream, request: "POST

I'm having issue when uploading file on production using meteor with nginx + passenger. I'm also using meteor files for uploading files. it worked great in development but i can't upload files in production. i got and error in browser console:

POST http://my-url/ net::ERR_INCOMPLETE_CHUNKED_ENCODING 200 (OK)

i found error in my passenger log file saying Not keep-aliving application session connection because application did not allow it here is the log:

[ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/HttpChunkedBodyParser.h:183 ]: [Client 63] ChunkedBodyParser: parsing new chunk [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/HttpChunkedBodyParser.h:123 ]: [Client 63] ChunkedBodyParser: chunk size determined: 982 bytes [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/HttpChunkedBodyParser.h:162 ]: [Client 63] ChunkedBodyParser: parsing 982 of 982 bytesof remaining chunk data; 0 now remaining [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/FileBufferedChannel.h:1416 ]: [FBC 0x7f71e801b670] Feeding 982 bytes [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/FileBufferedChannel.h:486 ]: [FBC 0x7f71e801b670] pushBuffer() completed: nbuffers = 1, bytesBuffered = 982 [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/FileBufferedChannel.h:554 ]: [FBC 0x7f71e801b670] Reader: reading next [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/FileBufferedChannel.h:586 ]: [FBC 0x7f71e801b670] Reader: found buffer, 982 bytes [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/FileBufferedChannel.h:493 ]: [FBC 0x7f71e801b670] popBuffer() completed: nbuffers = 0,bytesBuffered = 0 [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/FileBufferedChannel.h:594 ]: [FBC 0x7f71e801b670] Reader: feeding buffer, 982 bytes [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/FileBufferedChannel.h:554 ]: [FBC 0x7f71e801b670] Reader: reading next [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/FileBufferedChannel.h:561 ]: [FBC 0x7f71e801b670] Reader: no more buffers. Transitioning to RS_INACTIVE [ D3 2018-09-27 16:53:44.2194 2500/Ta Ser/FileBufferedChannel.h:539 ]: [FBC 0x7f71e801b670] Calling dataFlushedCallback [ D3 2018-09-27 16:53:44.2194 2500/Ta age/Cor/Con/ForwardResponse.cpp:64 ]: [Client 2-63] Event: onAppSourceData [ D3 2018-09-27 16:53:44.2194 2500/Ta age/Cor/Con/ForwardResponse.cpp:206 ]: [Client 2-63] Processing 7 bytes of application data: "\r\n0\r\n\r\n" [ D3 2018-09-27 16:53:44.2195 2500/Ta Ser/HttpChunkedBodyParser.h:248 ]: [Client 63] ChunkedBodyParser: done parsing a chunk [ D3 2018-09-27 16:53:44.2195 2500/Ta Ser/HttpChunkedBodyParser.h:183 ]: [Client 63] ChunkedBodyParser: parsing new chunk [ D3 2018-09-27 16:53:44.2195 2500/Ta Ser/HttpChunkedBodyParser.h:123 ]: [Client 63] ChunkedBodyParser: chunk size determined: 0bytes [ D3 2018-09-27 16:53:44.2195 2500/Ta Ser/HttpChunkedBodyParser.h:162 ]: [Client 63] ChunkedBodyParser: parsing 0 of 0 bytes of remaining chunk data; 0 now remaining [ D3 2018-09-27 16:53:44.2195 2500/Ta Ser/HttpChunkedBodyParser.h:164 ]: [Client 63] ChunkedBodyParser: end chunk detected [ D3 2018-09-27 16:53:44.2195 2500/Ta Ser/HttpChunkedBodyParser.h:267 ]: [Client 63] ChunkedBodyParser: end chunk reached [ D2 2018-09-27 16:53:44.2195 2500/Ta age/Cor/Con/ForwardResponse.cpp:224 ]: [Client 2-63] End of application response body reached [ D2 2018-09-27 16:53:44.2195 2500/Ta age/Cor/Con/ForwardResponse.cpp:1077 ]: [Client 2-63] Not keep-aliving application sessionconnection because application did not allow it [ D3 2018-09-27 16:53:44.2195 2500/Ta age/Cor/App/Socket.h:201 ]: Socket unix:/tmp/passenger.toEIX2t/apps.s/node.1si9u5: connection not checked back into connection pool. There are now 2 connections in total [ D2 2018-09-27 16:53:44.2195 2500/Ta age/Cor/App/Gro/SessionManagement.cpp:150 ]: Session closed for process (pid=2519, group=/var/www/hmn/bundle (production))

• Meteor 1.6.1
• Meteor-Files 1.9.11
• Ubuntu 16.04
• nginx 1.14.0
• passenger 5.3.5
• AWS

anybody know how to fix it and explain what is wrong? thank you!

from sendfile() failed (32: Broken pipe) while sending request to upstream, request: "POST