"Object reference not set to an instance of an object"
I am getting this error when I want to create or manage a Nintex workflow on a library.
Why is this happen, and how to solve?
Thanks in advance!
You may just need to Deactivate\Reactivate the Nintex feature. Try this on just that site collection for Nintex Workflow on the Web & site col level.
Checked this with Nintex support. It seems related to language settings. On development farm with Nintex Workflow 22.214.171.124 the WF Designer is working properly, with site collections created in English and in Dutch. On production farm we have version 126.96.36.199. When creating a site collection in English we get the same message, but site collections created in Dutch don't have the message.
Upgrade to version 188.8.131.52 did not solve the problem. Solution was to copy the WSS.ACTIONS from development to production. On production there was no WSS.ACTIONS, but WSS.ACTIONS.old.