Is https://github.com/op5/?p=nagios/op5plu ... are_api.pl
the version you are using? If not, where did you get it from? I will note, we did not write that plugin, so our support will be limited. Of course, community members can also chime in.
Also, I'll note the version of Core you are running is really old. I would highly suggest upgrading: https://assets.nagios.com/downloads/nag ... ading.html
If you installed from distribution repos, then the best option is to wait for the repos to update...or to uninstall your repo version and install 4.2.4 from source.
What version of VMWare are you running? On what OS/version are you running Nagios?