I was having problems with my Nintex forms having an error if they were part of actions such as Flexi tasks, to do tasks and request data. After following some advice from Google, I deleted the web part on the form page. After that I am getting an error on every action that needs a form regardless of if they are Nintex forms or default SharePoint forms. The error message is "Error in request approval action. Object reference not set to an instance of an object."
I have tried to deactivate and reactivate Nintex workflow features on the site, and the error is only occurring on the one team site. I thought I'd ask if anyone else has had this issue and knows how to solve it before fully reinstalling Nintex.