After i fix the problem and i create this thread to help you.
1. Download the Official KDZ firmware of LG G7 ( it's a large file ): https://goo.gl/ESWAhb
2. Uninstall LGUP if you have an old version, restart the PC, and install this new version of LGUP: https://goo.gl/GRFHGu
3. Download this ZIP file : https://goo.gl/6idLqN
4. Open the ZIP and copy the DLL file ( named "LGUP_Common.dll" ) in this directory " C:\Program Files (x86)\LG Electronics\LGUP\model\common ". If there isn't the common folder, create it and copy the dll file inside.
5. Now the LGUP program works without any Error.