Can not create post (error "something went wrong after loading the editor")

[Klaas Chielens]

I have a brand new server installation of confluence (so no content yet).
This confluence is linked to a jira server for user administration.
This confluence is also linked to service-desk to set up a knowledge base. 

When I try to add a "how-to" (first article, tryout), I can add labels but when clicking "create" i get the following error 

• Something went wrong after loading the editor. Copy your unsaved changes and refresh the page to keep editing.

The tags are created but the pages are not. The same happens if I do not add tags.

[Klaas Chielens · Accepted solution]

Switching off collaborative editing seems to "solve" the problem. 

[Manfred Lauterbach]

(unrelated to Confluence - JIRA Only case)

The "something went wrong" error was caused by : the specific issue type I was working on did not contain the labels field.

Adding the labels field to that issue type, allowed me to add a label accordingly