Call to undefined method RW_Meta_Box::get_class_name()

[Patricio]

Good afternoon,
I have just installed the SNS Nitan theme and when I try to edit a page I have two problems:

I have the error code:
Fatal error: Call to undefined method RW_Meta_Box::get_class_name() in … /wp-content/themes/snsnitan/framework/sns-metabox.php on line 771

I am also unable to modify the Visual Composer. It seems it needs an update and the only way to get it to work or to update is to purchase an activation code. I thought that this theme came with the Visual Composer as part of the download.

Please help as at the moment there is nothing I can do with the site.

[Author]

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