The plugin uses PHP shell_exec if it is allowed to do so. If it is allowed; it then launches a couple of shell commands, one of which “groups” is not a valid windows command (it is a perfectly valid Linux command though).
The way I got round this was to harden my server by editing php.ini and adding
disable_functions=shell_exec
There were other functions to disable here for hardening but for the purposes of this fix I have excluded them as they are unrelated to this issue.
By doing this, The plugin falls back to another method, doesn’t try to execute invalid commands and doesn’t therefore, dirty up your error.log
The exact details are security related so have also been excluded form this post, hope this helps
