"bindED Error - Object reference not set to an instance of an object."
The plugin is throwing an exception, which means a situation has arisen that the plugin is not set up to handle gracefully, so it cannot work correctly.
It's likely a configuration issue, I.E. something went wrong with your specific installation rather than a general issue, as I can't find any references to this issue in relation to HCS, or even bindED.
Did you have a working voicepack before at some point, or has it never worked?
Either way, it seems to me like something may have gone awry at some point during the setup, so you may want to try reinstalling the pack.