React Native update - main.jsbundle - Native module cannot be null

I updated today from react-native 59.10 to 60.6. After some linking bugs in iOS, I was able to build the project on iOS. First I had the 'No bundle url' Error see here:stackoverflow

Then I executed the following command to rebuild my main.jsbundle file:

react-native bundle --entry-file index.js --platform ios --dev false --bundle-output ios/main.jsbundle --assets-dest ios

The error went away but a new occurred:Native module cannot be null

I can't really find a solution. I rebuilt the main.jsbundle file several times, but I still have this error. I also don't find similar errors online. Also, the error description is not really helpful.

I use this version:

"react": "16.8.6","react-native": "0.60.6",

If it helps, I can also post it package.json or my pods. I just don't know where to start.Thanks a lot!