I've updated my libraries, but I'm still getting compilation errors. What could be wrong?

Sometimes, a simple restart of the Arduino IDE is needed to clear cached files. Also, try cleaning the project (Sketch > Verify/Compile, then delete the temporary files in the sketch folder). If using PlatformIO, run `pio clean` in the project directory. Incompatible library versions can also persist; try downgrading to older, known-working versions.