I tried to export my Nintex workflow from the test sharepoint server and import to my production sharepoint server. but after importing, during run time, I got this error for the flex action: Error in task. Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression. the same workflow works fine on the test sharepoint.
we use Sharepoint 2013 and Nintex 2013 on both servers.