No such column 'DeveloperName' on entity 'RecordType' after Summer '19 release on sandbox

Please recompile all classes in org by using compile all classes link on apex classes page under setup or you can do runAllTest in org which will recompile the covered classes. This will fix the issue. We faced a similar issue after Summer 19 release and got it fixed by recompiling all the classes.

Check this Know Issue with workaround: salseforce known issue

​​​​​​Workaround Use Metadata Api or VS Code and SFDX to deploy changes to your lightning components