WordPresstheme "Earth" by Themeforest Error

It’s probably a theme issue in which case you’ll need to contact the theme vendor for support. But incase it’s not try these steps to identify where the problem is.

Have you tried:
– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the Twenty Eleven theme to rule out any theme-specific problems.

– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress.