First go to storage sense in settings. There u will find 'store new apps on my'. Select phone for this setting. In store sense at the top u will find
'see what's taking up space on your phone
Phone
SD card'
Select Phone. Then select apps+games. Check whether true caller is there in this list of apps. If it is not there then go back to storage sense and select SD card. Then select apps+games. Then u will see true caller in the list of apps. Select true caller. Then select 'move to phone'. After the app has been moved to phone and the setting 'store new apps on my' is on phone, u can update true caller and the error code 8103012e won't be shown :smile: