License Delivery maintenance is expected to occur on Saturday, October 19, between 4 and 6 PM CEST. This may cause a short 60-minute outage in which license-related tasks: license key upload, download, update, SSA validation, access to the license pool may not function properly. We apologize for any inconvenience.
Documentation
About Archicad's documenting tools, views, model filtering, layouts, publishing, etc.
Is ArchiCAD in the same folder as PlotMaker? Is it a clean install? Have you run an updater on a modified installation? If you have changed the names of the applications (or made multiple copies) the updaters don't work properly.
I just updated the file about 2 hours before I got the error message. I had to go in a just create a new layout book. That seemed to fix the problem. But, who knows how long that will last.