Build Kernel on ROCK 5B ,the file 'out' is empty

Build kernle follow the URL:Build Kernel on ROCK 5B;

I cannot upload the log because I am new comer

Wiki is really outdated, same for 5.1 kernel, sadly there is no much information about that there,
currently docs.radxa.com is the way to go,
for kernel builds there is page for ROCK 5B
https://docs.radxa.com/en/rock5/rock5b/low-level-dev/kernel