Envato主题检查

I have converted HTML to Wordpress. That's why I have created some custom widgets and it's working fine. Now I am trying to solve error using Envato theme check plugin. I have solved most of the waring but can't solve. I can't understand what is the problem of this error?

As per the themeforest guideline, registering new widgets are not allowed inside the theme. register_widget is a plugin teritory function and should be called from a plugin. I suggest you to put that the code into a plugin and make that plugin required in the TGMPA list.

You can find a guideline here