Fatal Error

Hello, can you help me buy fixing this issue with the plugin?

[Fri Jul 05 01:34:36.595065 2019] [php7:error] [pid 16532] [client 249.248.140.250:36124] PHP Fatal error: ob_start(): Cannot use output buffering in output buffering display handlers in /home/showmetechcom/public_html/wp-content/plugins/widget-shortcode/includes/class-widget-shortcode.php on line 219

It seems that this error states that the Output buffering headers cannot be used by the output buffering due to a misconfiguration in the following plugin: widget-shortcode