Cause:
The UserPrograms directory in the controller's ftp contains files other than .sr folders and .srd and .srp files.
Troubleshooting:
Go to ftp://192.168.39.220/UserPrograms/ and check whether there are files other than .sr folders and .srd and .srp files.
Solution:
Contact after-sales support and delete files other than .sr/.srd/.srp.
Case sharing:
None.