"Undefined class constant" Error after upgrade

While Joey’s solution should work, the issue seems to only be in the source code.

Perhaps this procedure is even better in this case:

  • backup current mautic source somewhere on the server
  • check the version of mautic, go to Mautic GH release page and download fresh source on to the server
  • extract the source on the server
  • put config and & media folders from backup to this fresh mautic source
  • clear the cache

No need to install it on another server or re-run migrations.

Best, M.

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