It’s looking like a corrupt file in your Saved Variables, though reinstall was done, that won’t resolve this issue.
Ensure that World of Warcraft and battle.net is not running.
Open Dugi Installer, click Settings and then click Repair. That will completely uninstall all Dugi Guides files and reset’s Dugi Guides saved variables. Click on Okay button and then Okay button once again, then click Reinstall if it doesn’t do it automatically.