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Hi Eddy,

I remember someone having the exact same problem with another thing. Could it be you're using a Pro Mini clone with an ATmega168? The Pro Mini should have an 328P but the 168P ones come with only 1 KB of SRAM.

https://store.arduino.cc/arduino-pro-mini

Try commenting out all "Serial.println" stuff you see. Should only be 2 or 3 lines and this should save enough memory to upload to 1kb.

Edit: Try commenting out the following lines:

105 - 107 (serial.begin and 2 lines with serial.print in void setup())
261 (entering setup mode in setupClock())
307 (setup done in SetupClock())

That should get you down to about 860 bytes memory usage.