To build on GoldingD's reply, Logitech utilities silently install a LR plugin called LogiOptionLr that can cause this error message. So even if you didn't explicitly install LR plugins, that plugin could be installed. Do File > Plug-in Manager and scroll the list of plugins looking for LogiOptionLR. If it's there, select the plugin and click Disable in the Status panel to the right. Then restart LR.
If you don't have LogiOptionLr installed, there are many other causes of that error message, unfortunately.