As @gokermu referred, Somewhere in there you have the Objects library from 2.19wip installed while the connector version is 2.18 or vice versa.
If you are testing 2.19 for Rhino8 support, but it looks like connectors have been installed At version 2.18, I’d try an uninstall of GH&Rhino connector from manager.
While uninstalled, check in the plugin manager of Rhino (any version you are using) to see if another Speckle plugin is floating somewhere.
Then make sure 2.19wip is the version installed for all ADSK/mcneel/csi connectors.