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The UI Fail to delete folder Error may appear while opening the project manager in Promis.e or Bentley Substation.
This error might be occurred because of a sudden shut-down of promis.e or because of some unwanted changes done in the previous session. And sometimes this may happen because of the antivirus installed in the machine too. Generally the ByteFence anti-malware can create this.
Option 1
Reboot the computer on which the software is installed and try again.
Option 2
Delete the temporary project options(.xml) file which is located in “C:\Users\user\AppData\Roaming\Bentley\promis-e V8i(M)”.
Also delete the temporary files located in “C:\Users\User\AppData\Local\Temp”.
Option 3
Try to uninstall the antivirus and restart the machine.