Problem with Posting Blog Text

Hello,

Its been awhile since I updated my blog, and the current version of WordPress now uses a method of inserting blocks to create text content for a post. After getting used to this process, I have found that my SiteOrigin Layout Block does not function. Instead I get this error message:
Failed to load plugin url: http://nancywinberg.com/wp-content/themes/austin/framework/admin/tinymce/langs/en.js

I am guessing that there is an issue with my plugin which is up to date. The Posts Tab is the only place where I get an operational problem. When I try to insert a SiteOrigin Layout Block or click on the Add SiteOrigin Layout Button, I get this error message:
This block has encountered an error and can not be previewed.

This feature seems important for styling my Theme, as when I insert other types of text blocks, the text runs off the screen in mobile view. I have a responsive website and this is upsetting. I am running the Austin Theme vs. 2.5 by LiveMesh on WordPress 5.1.1 I have the SiteOrigin Widget Bundle and SiteOrigin Premium plugins installed.

Here is my website http://nancywinberg.com/

Thank you for your help,

Nancy Winberg