Website No longer works when switching from Smush to Smush Pro

I need to compress an image to retain clarity but not take so long to load the webpage.
Smush could not do this because the image was too large of a file size, so I purchased Smush Pro.

As soon as I attempted to "Smush" media on my site my entire webpage stopped working on the front end.
As soon as I deactivate Smush Pro everything came right back to normal.

What's going on? How can I fix it? I want to utilize the service I'm paying for and make my site load faster by reducing this picture's image size!

Thank you for the assistance!