"Debugging and troubleshooting", "List of MyChat Client errors", "Error #0311".

 
Error

Error #0311: function is unavailable, you must use Windows 10 or newer
 

Error description

You can't use MyChat Client feature because the operating system you use is too old. As a rule, such an error is displayed when making calls or using the tool for viewing GPS tracks in the chat. It deals with libraries or technologies that do not exist in old operating systems of Microsoft.
 
Problem solution

Update OS Windows to 10 version or newer.