After deactivating the theme I am facing the following message "The file radio_widget is not exists": on all pages, please help.
It seems that the Uploader theme plugin is active but you changed your active theme, please follow the easy steps to fix it quickly.
1. Login to your FTP or cPanel Site Manager.
2. Browse to directory wp-content/plugins.
3. Delete the plugin exc-uploader-theme, do not worry as on activation theme will ask you to install and activate it again.