I’m not sure that the path of the library is incorrect. It’s actually part of the IDE installation. I did not need to include any special ones. I can include the library. If I check #include <ehtrpoeroghaeproghaerg.w>, there would be a problem. #include <SerialLCD.h> it works. I had the old versions of the grove LCD screens working previously, but the old code no longer works. SerialLCD slcd(1,2); generates an error.