Saving Data on Android

Room cannot verify the data integrity. Looks like you've changed schema but 
forgot to update the version number. You can simply fix this by increasing the 
version number.
Note
: If the app didn't crash, you might have forgotten to press the 
START
 
button earlier, when you ran the app before making the modification. If the 
app crashed but you got a different error message, try uninstalling the app 
from your device or emulator and repeating the steps above.
Did you expect that crash?
Each time you change the database schema, you need to change the database 
version. This will help Room know which migrations to run when building the 
database.
The error seems simple enough to fix, right? According to the logcat console, you 
just need to increase the version number, so try that now.
Saving Data on Android
Chapter 10: Migrations with Room
raywenderlich.com
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