Gateway Timeout Error


I have NextCloud server and I Sync files and folders to that server using the NextCloud desktop client, sometimes I have the following error

#=#=#=#=# Propagation starts 2018-03-05T12:50:11 (last step: 1413 msec, total: 1413 msec)
||seven -> seven8|INST_RENAME|Up|1520246987|5a9d20cb357ef|0|00100395ocrv84czw5vp|2|Error transferring http://url to my server/remote.php/dav/files/17007/seven - server replied: GATEWAY_TIMEOUT|504|0|0|||INST_NONE|

what does that means?



I have the same problem.
Did you solved it