Cause:
The controller's ftp://192.168.39.220/ConfigureFiles/ contains no RobotUserInfor.xml file.
Troubleshooting:
Check whether RobotUserInfor.xml exists in the controller's ftp://192.168.39.220/ConfigureFiles/ directory.
Solution:
Contact after-sales support, copy a RobotUserInfor.xml file to the controller's ftp://192.168.39.220/ConfigureFiles/ directory, and analyze why the file is missing.
Case sharing:
None.