if you found this page then you probably have installed alsaequal and see the following when trying to configure it in alsamixer or play audio through it.
$ alsamixer -D eq Failed to load plugin "caps.so": caps.so: cannot open shared object file: No such file or directory
most likely, your system has caps.so at /usr/lib/ladspa/ instead of /usr/lib/- where alsaequal is hard-coded to look.
you can link it so it is where alsaequal expects it to be to fix the issue.
$ sudo ln /usr/lib/ladspa/caps.so /usr/lib/caps.so