You can resolve it by adding the following code to framework/widgets/mo-widget.php file at line 20 –

    public function WP_Widget( $id_base, $name, $widget_options = array(), $control_options = array() ) {
        parent::__construct( $id_base, $name, $widget_options, $control_options );
    }

Could you be more specific, please?

You need to access themefiles.
Pls go to the folder framework -> open widgets folder -> pls find the file mo-widget.php and insert the above given code (copy paste) at line no:20 in file mo-widget.php and see if that helps.

Pls share a valid temp login details with admin rights.

I tried multiple times to connect FTP but hitting the same error –

Error:	Connection timed out after 20 seconds of inactivity
Error:	Failed to retrieve directory listing

Can you pls share a temp login to your wordpress site here as a private reply?

An theme update is being submitted in next few hours which will take care of this issue. Pls wait. Until then, pls set WP_DEBUG to false in wp-config.php.