After modify IRremote.h, I uploaded testIR.ino. Serial monitor show "IR Receiver Button Decode". Then I cannot upload OpenCat.ino. Problem about my board? Or anything that I miss?

@Rongzhong Li After I follow this step 1. uploaded WriteInstinct.ino 2. executed commands via serial monitor 3. uploaded testInfraredRemote.ino 4. The serial monitor displays: 13:36:41.639 -> IR Receiver Button Decode 5. When I press any button on the remote, nothing is displayed. 6. Then I uploaded OpenCat.ino I facing this trouble. Can you help me?

Which file Nybble.ino? It is same with OpenCat.ino?