https://bugzilla.wikimedia.org/show_bug.cgi?id=58357

       Web browser: ---
            Bug ID: 58357
           Summary: misleading error message on edit header conflict
           Product: MediaWiki extensions
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Flow
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected]
    Classification: Unclassified
   Mobile Platform: ---

I was trying to edit the header of Talk:Flow for the first time. But someone
else had snuck in and created the header while I was editing.  The result of
[Preview] or [Save header] is an errorbox

   "An error occurred.
   The error message received was: Previous revision identifier is missing."

the failing API call is:

{"warnings":{"main":{"*":"Unrecognized parameter:
'workflowId'"}},"flow":{"edit-header":{"result":"error","errors":{"header":{"prev_revision":"Previous
revision identifier is missing."}}}}}

(The message would be different if the header already existed and there was an
edit conflict.)

The workaround is to reload the page and then edit the page. The fix is edit
conflict handling.

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