"Debugging and troubleshooting", "List of MyChat Client errors", "Error #0329".
 
Error

Error #0329: no plugin for calls
 

Error description

A user can't perform a call because there is no plugin installed.

 
Problem solution

Right after MyChat Client installation, the plugin for calls downloads from your server via http(s) protocol. It can take some time.

 

The plugin's size ~ 50 megabytes. If your connection with the server is slow, it may take some time.

 

You can copy this plugin manually from another computer that has it: C:\Users\%USERNAME%\AppData\Local\MyChat Client\webkit\