Errors in compiling code

[nikandriko]

@phord I'm getting this error when I verify the code on the Arduino IDE.

I suspect I might be missing some library.

c:/users/xx/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\Jarvis.ino.cpp.o: in function _ZN12TelnetLogger9print_rawIPKcJ6StringcEEEvRKT_DpT0_:

C:\Users\xx\Documents\Arduino\5. Debugging\Jarvis\src/TelnetLogger.h:36: undefined reference to _ZN3Ota5beginEv

c:/users/xx/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\Jarvis.ino.cpp.o: in function setup:

C:\Users\xx\Documents\Arduino\5. Debugging\Jarvis/Jarvis.ino:71: undefined reference to _ZN3Ota5beginEv

c:/users/xx/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: C:\Users\xx\Documents\Arduino\5. Debugging\Jarvis/Jarvis.ino:34: undefined reference to _ZN3Ota4loopEv

c:/users/xx/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\Jarvis.ino.cpp.o: in function loop:

C:\Users\xx\Documents\Arduino\5. Debugging\Jarvis/Jarvis.ino:39: undefined reference to _ZN3Ota4loopEv

collect2.exe: error: ld returned 1 exit status

exit status 1

Error compiling for board LOLIN(WEMOS) D1 R2 & mini.

[phord]

I haven't seen those before. It does look like it's missing a library, or that the function signatures are wrong for it.

Are you able to build 'blink.ino' for your Wemos successfully?

[imightbelosthere]

Check your ota.cpp file. There are 2 with the same name and Windows overwrites the one with code by the one that's empty.