i got this error log

Please check your TypeOfTaxPayer Sync logic. In this table(TypeOfTaxPayer) you are inserting a new records that is not exist in your "General " table.

As per your table "TypeOfTaxPayer" you created Id as "General Identifier". So make sure that General should be available in General table with same Id.

Thanks

Vinod 

According to this error log. TaxPayer table has foreign key of General table. Now while inserting TaxPayer record value which you are passing for GeneralId is not there in General Table. So database is not able to establish foreign key relation. That's why this error.

So when entering TaxPayer table record, you must include that for Genearl Id foreign key there must be any valid Id for this. 

If it can be blank, then mark it as non mandatory field or pass nullIdentifier() in create method of TaxPayer.

Regards

Yea I fixed those things but still the app got exit when pressing sync can u please look through my sync logic