Question: When I try to login an account book which was upgraded from 1.9 to 2.0, system prompted “Primary Key Error”. Why?
Possible Reason:
The registry value failed to upgrade properly when upgrading the database.
Solution:
1) Search and open SQL Management Studio from window search.
2) Connect SQL Server Management Studio.
3) Click on the database name that failed to login and Execute the below query:
update Registry set RegValue='2.13' where regid=0x4
Now, you may login to AutoCount.
--Source from AutoCount Wiki --