Constantly getting '404 Not Found' error while uploading .csv files

[Santosh Prajapati]

I am trying to migrate issues from .csv files using 'External System Import' feature and getting error after mapping all fields of jira against the .csv file.

Note - file carries issues between 250 - 500 rows.

Please suggest. 

[Prince Nyeche]

To understand the error, you have to know what the logs says. If you're getting 404 Not found, that could mean a field doesn't exist or something else. Therefore if you have the full error logs, you should post that instead, as that would explain things much better.