DiscordChat 3.0 error

Hello, I updated the Discord Extension to the latest version (3.0) from GitHub and also used the DiscordChat version (3.0). Unfortunately, when the plugin is compiled, the console returns the following error:

`Error while compiling DiscordChat: 'string' does not contain a definition for 'AsReadOnlySpan' and no accessible extension method 'AsReadOnlySpan' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?) | Line: 582, Pos: 42`

Is there any possibility of an update?

Thank you.

.NET Framework is in the required version.