Caught a FileNotFoundException; cannot validate missing file requested as temporary://filefield_paths/

I saw a similar issue. The problem was misconfigured temporary files directory on Production. Production was behind the load balancer hosted on multiple nodes/instances and the temp dir was configured to use instance local file system that was only available for the curently used instance. The temp dir needs to be available for all instances behind the load balancer, as the traffic is directed to multiple nodes.
I am not sure if this will help in your case as there is not enough details.

Thank you @drOptimum!! I checked the dir configs and that solved the problem. Thanks again!

Automatically closed - issue fixed for 2 weeks with no activity.