get type mis-match error

[mggyi]

When I run make, I got the error:
/home/kali/Applications/afsk-decoder/src/main.cpp: In function ‘int main(int, char**)’:
/home/kali/Applications/afsk-decoder/src/main.cpp:116:27: error: operands to ‘?:’ have different types ‘main(int, char**)::<lambda(std::string)>’ and ‘std::nullptr_t’
116 | printInfo ? normalWriter : nullptr,
| ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/kali/Applications/afsk-decoder/src/main.cpp:117:29: error: operands to ‘?:’ have different types ‘main(int, char**)::<lambda(std::string)>’ and ‘std::nullptr_t’
117 | printErrors ? redWriter : nullptr,
| ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
/home/kali/Applications/afsk-decoder/src/main.cpp:119:26: error: operands to ‘?:’ have different types ‘main(int, char**)::<lambda(std::string)>’ and ‘std::nullptr_t’
119 | printRaw ? magentaWriter : nullptr
| ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [src/CMakeFiles/afsk_decoder_run.dir/build.make:76: src/CMakeFiles/afsk_decoder_run.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:172: src/CMakeFiles/afsk_decoder_run.dir/all] Error 2
make: *** [Makefile:136: all] Error 2