Apple - Trying to force update_dyld_shared_cache but having some errors
What fixed it for me was
update_dyld_shared_cache -debug
This is what you should see
update_dyld_shared_cache: adding root: /System/Library/...
...
...
update_dyld_shared_cache: /var/db/dyld/dyld_shared_cache_i386 is up-to-date
update_dyld_shared_cache: /var/db/dyld/dyld_shared_cache_x86_64 is up-to-date
to be sure it works I run
update_dyld_shared_cache
a second time
Reboot your mac in recovery mode (https://support.apple.com/en-ca/HT201314), Open Terminal there and type
rm -rf /Volumes/<your_system_volume>var/db/spindump/*
After that restart your mac and repeat the operation
sudo update_dyld_shared_cache -root / -force
PS see detailed comment from @CharlieMonroe