Hi.
What project are you following and what is the error that you’re getting?
Regards,
Sara

Sorry, it must have been yet another of my mistakes!
I was trying the “Hello World” sketch for an OLED, from the RNT list of projects, but the compiler objected to <#include Adafruit_GFX.h>.
I searched the list of libraries, but could not find it, hence my query. However, I tried it all again just now and it compiled and ran with no problems,  so I must assume that something I entered yesterday was wrong. My apologies.
Although I’d love to know why I couldn’t find it yesterday.
Bob

Ok.
I’m glad everything is working now.
I’ll mark this issue as resolved. If you need further help, you just need to open a new question in our forum.
Regards,
Sara