I upgraded one of our sites from 8.1 to 9.2. Now I'm getting 'Object reference not set to an instance of an object' error when I go to the site. It errors after the 'System is initializing' message. No stack trace or other information is given, there is nothing in Error.log or Trace.log, and nothing in Windows event logs. I have no idea where else to look or where to start with this. Opening the site via Visual Studio doesn't seem to produce anything useful either. Thoughts?
I had similar problem recently after upgrade from 6.3 to 9.2
I found the solution, which worked for me.
0) Create backup for DB and files
1) Go to App_Data\Sitefinity\Configuration\SystemConfig.config
2) Comment all child nodes under <systemConfig>
3) And run your project again