It wrote what you had to do in your log file
I think that the further problems come from the first error.
echo " ERROR: Kernel configuration is invalid."; \
echo " include/linux/autoconf.h or include/config/auto.conf are mis
echo " Run 'make oldconfig && make prepare' on kernel src to fix it
If you have kernel sources installed properly, I think you just have de run that command. Otherwise, you'll have to install / reinstall kernel sources for the script to find missing files. Third possibility, compile a new kernel from sources to start over from clean sources.
Maybe there are some precompiled kernel and sources to do so easily. There are some useful comments below the tutorial also.
Please let me know if you solved your problem.