ERRORS you may see caused by Library problems:When you try to Verify (Compile) an Arduino sketch you may see error messages like these:Ultrasonic_Serial.pde:1:24: error: Ultrasonic.h: No such file or directoryUltrasonic_Serial:4: error: 'Ultrasonic' does not name a typeIf you are seeing errors like those, it means a Library the sketch needs cannot be found. This is probably because you never downloaded the needed library, or it was installed incorrectly.
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