Process Model publish error

Question

Hello everyone, 
 
 i am having a problem in publishing my process model, it gives me this error: 
 
 everything is OK, i don't know where is the problem, could anyone help me in this? thank you,

Laurens Weijzig · Answer

Have you spotted this thread on the same topic? https://community.appian.com/discussions/f/process/918/am-getting-the-following-error-while-saving-the-model-any-idea-invalid-in The discussion is 9 years old though. 
 Have you checked and/or re-mapped all items under the data tab for all nodes? 
 If the issue is still not found, delete nodes one by one to see where the issue resides. Then inspect further.