Make error in Gnu Radio

Hey everyone, I have a problem. I am following the OOT(OutofTree) module tutorial,
Link: OutOfTreeModules - GNU Radio
and I am at the part it involves using the cmake command line. I have followed everything it said and for the parts where I am using pybombs I made the changes. I am using Gnuradio and Ubuntu 20. I am stuck at this point and I have search for the past couple of days and my advisor to ask online. If anyone can give me hint that would be great. I have left the error behind so you can see it. This is the first time doing this so if I left something out let me know so I can add or change it. Thank you for your time.

make[2]: *** No rule to make target β€˜/usr/lib/x86_64-linux-gnu/’, needed by β€˜lib/’. Stop.
make[1]: *** [CMakeFiles/Makefile2:272: lib/CMakeFiles/gnuradio-howto.dir/all] Error 2
make: *** [Makefile:141: all] Error 2

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I was wondering if you ever figure out how to fix this error