The OIT Sketch compiles fine. The panel sketch has the following error. libraries\AltSoftSerial\AltSoftSerial.cpp.o (symbol from plugin): In function `AltSoftSerial::read()': (.text+0x0): multiple definition of `__vector_11' sketch\Pool_Heater_Panel_V2.ino.cpp.o (symbol from plugin):(.text+0x0): …

Compiler error in one sketch, but not another?

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