C:\Users\default\AppData\Local\Temp\ccXcR1FZ.ltrans0.ltrans.o: In function global constructors keyed to 65535_0_CustomKeypad.ino.cpp.o.1890': <artificial>:(.text.startup+0x8c): undefined reference to Key::Key()'
:(.text.startup+0xa6): undefined reference to `Key::Key()'
collect2.exe: error: ld returned 1 exit status
exit status 1
Compilation error: exit status 1
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the error is in the first mesage
Please take the time to read How to get the best out of this forum.
Then post the sketch you are having problem with, in its entirety, properly enclosed in code tags. No one has any idea what your code looks like unless you show us. Also, tell us what board you are using.
Details such as what type of board you are compiling for would be helpful too
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