This issue might be happening due to the license verification failure which occurs for various reasons such as logging in with another App Store account with which you did not make purchase of the Money Manager, Sim-card replacement, etc.
In this case, you need to reinstall the application.
Please make a backup file of your data before reinstalling the app.
Please make sure to use the same Play Store account with which you purchased Money Manager in order to resolve this issue.
After reinstalling and checking if the app is running as you expected (without ads),
you may restore your previous data and use the app just as you did before.
If this does not work, please try reinstalling Money Manager on your device using a PC following the steps below.
1. Delete Money Manager App
2. Log in to the Google Play Store on your PC.
3. Install the Money Manager App on your phone.
Please check how the app behaves after reinstalling,
and if it work as expected, please restore your data on
More tab > Backup > Backup/Restore On Device > Choose the backup file you wish to restore.