openconnect issue solution-seeking：Could not open vpnc.log: 5

[Gongxin (AMS)]

Hello,
please I need some guidance and help with a OpenConnect-GUI issue. I'm using OpenConnect-GUI for Windows.
I'm getting an error message "Could not open C:/Users/XXXX/AppData/Local/Temp\vpnc.log: 5". 
Uninstalling and Reinstalling the OpenConnect didn't help at all. 
I feel like OpenConnect is not deinstalling correctly, which causes mistakes from installing it to stay in the machine.
Is there a way to fix the vpnc.log issue or completely clean system to get a fresh start with OC-GUI? Thanks.
BTW，the Attached is the OpenConnect-GUI log.
Best regards

Gong Xin