Hi, thanks for your reply.
3.9 still uses InstalledPlugins.txt. I did copy that already to 2nd server after install on first. Otherwise plugin would not activate on that 2nd server.
It does and it throws said errors.
Why would it be a problem? Nop 3.7 added WebFarms.MultipleInstancesEnabled configuration to make sure scheduled tasks are ran only at one node at a time.
Best regards Martin