Adding new slider no longer works

I have been testing the UR Image Slider for some time. Yesterday I created the 8th slider. When I go to preview an unpublished post, the entire design is shot and the slider is not displayed. When I try to publish this post I get the error message: critical error.

Existing sliders still work in the corresponding post. if i insert an existing slider into a new post, it works as well.?
The problem is that i can create new sliders, but when i insert them, they cause problems.

No changes have been made to the system such as new plugin or updates. I use WP 6.2.2