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here is the issue open in git https://github.com/NodeBB/NodeBB/issues/9125
please request to check cluster support before launching update.
@baris said in Upgrade from version 1.14.x to 1.15.x got error:
Upgrading these two dependencies should fix this error "@nodebb/mubsub": "1.7.1", "@nodebb/socket.io-adapter-mongo": "3.1.1",
Upgrading these two dependencies should fix this error
thanks solved.