Cannot create unknown type '{http://schemas.uipath.com/workflow/activities}LogMessage

Help Activities
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The Log Message activity is part of the UiPath.System.Activities package. That means that the package is not installed correctly or not installed at all by the robot user in the %userprofile%/.nuget/packages.

If the robot has access to external feeds, you need to have one of these sources in the Nuget.config in the robot installation folder:

    <add key="OfficialUSNew" value="https://pkgs.dev.azure.com/uipath-us/Public.Feeds/_packaging/UiPath-Official/nuget/v3/index.json" />
    <add key="OfficialNew" value="https://pkgs.dev.azure.com/uipath/Public.Feeds/_packaging/UiPath-Official/nuget/v3/index.json" />

If you don’t have access to these sources, then you need to have all the required nupkg of dependencies in a location where the robot can retrieve (usually in the Orchestrator libraries feed).

Check in the Event Viewer logs for Application you can see some NUxxxx errors.