Having an issue where I'm trying to import a series of CSV files into the Civi Contact Database. There were new custom fields created to do the import, but when I do the import with all the fields, I get an 'DB Error: constraint violation' error. If I just import the fields that were originally there, I successfully import the CSV into the DB.
So I must have done something wrong with the custom fields I created yesterday. But what? What should I look for to make sure the import is successful?