Uncaught TypeError: Cannot read property '__Ionic_DataTypeSchema' of null

After run ionic app on android i got the error message: Uncaught TypeError: Cannot read property ‘__Ionic_DataTypeSchema’ of null

Any idea what can i do?

The same issue is with me. The app runs once but when I try to restart the app, it shows this error

My problem was the user and the user id. Please check, if your user has an correct user id and the user id is stored at ionic.
You can remove / uninstall the app and reinstall it.

I solved similar issue by deleting all ionic related keys from localStorage

@timsly Can you please share the names of the key you removed from localStorage ?

This happened to me while testing (ionic serve -lc) in Chrome. From the Chrome Developer Tools, select Resources > Local Storage > host_name and delete the keys that are causing the problem.

For me, I removed them all and then reloaded the page.

I think I found the underlying problem, I posted a new Pull request for the ionic-platform-web-client repo https://github.com/driftyco/ionic-platform-web-client/pull/116

As @robrusher said you can remove them all