What the error is saying is the database has set it as unique, and you have to fix it before you can do other fields as well.
Presume you can use a GUI tool to remove the unique constrain to fix it.
What the error is saying is the database has set it as unique, and you have to fix it before you can do other fields as well.
Presume you can use a GUI tool to remove the unique constrain to fix it.