Minimstreamer 'Chain: error running chain'

[Pabloboyo]

I have exactly the same issue Minimstreamer 'Chain: error running chain'
None of my minimstreamer streams are working since the latest minimstreamer update.
My server is running Ubuntu 22.04 and I have not changed any config files. Looking at debug logs, the streams are being found and the transcoding required is recognised, but nothing gets streamed and the log shows "Chain: error running chain"
My license is still valid until Feb 2026.
Minimserver is still streaming non transcoded files just fine.
Help please.