Warning: dirname() fopen fread fclose errors

Hello, Thanks for the excellent plugin. I’m getting the following upon install on a test site.

Please let me know if I can provide any additional useful information.

Warning: dirname() expects exactly 1 parameter, 2 given in /var/www/virtual/website.com/elementor/htdocs/wp-content/plugins/widgets-for-elementor/templates/admin.php on line 6 

Warning: fopen(/widgets-for-elementor.php): failed to open stream: No such file or directory in /var/www/virtual/website.com/elementor/htdocs/wp-includes/functions.php on line 4848 

Warning: fread() expects parameter 1 to be resource, boolean given in /var/www/virtual/website.com/elementor/htdocs/wp-includes/functions.php on line 4851

Warning: fclose() expects parameter 1 to be resource, boolean given in /var/www/virtual/website.com/elementor/htdocs/wp-includes/functions.php on line 4854

Widgets For Elementor Version 1.0.6
Elementor Version 2.2.5
Wordpress Version 4.9.8