sqlite database can't execute query after re-synchronization

In my android application i created database, and write datas by asyncTask and it's a synchronizable database,and there is an option to reset and export my databases.

if it's the first run of application everthing is OK.
I can do synchronizations and after pull datas,All screens work normally.
 But when i reset tables and made synchronization again there is no result to show,
but i can see database where is the file location that i exported. i need help.