The "path" argument must be of type string. received undefined when trying to update KLAX. I uninstalled KLAX and tried it as a clean install and the inimanager stiill displays the message at the bottom of the program.
Myself and others have been doing flights between LAX and SFO all day and no one has reported your issue. Have you checked your content manager and verified KSFO is installed? You could reinstall it or check for scenery conflicts with a third party add on. Only Asobo LAX was required to be removed.