Step-by-step guide

#1 Fix

• Go to WordPress > Plugins
• Deactivate and then Activate the Testimonials Widget plugin
• This should fire off the flush_rewrite_rules function automatically.

#2 Fix

• Go to WordPress > Settings > Permalinks
• Click “Save Changes” to fire off the flush_rewrite_rules function manually.

#3 Fix

• Go to WordPress > Testimonials > Settings
• Click on the Post Type tab
• Check that the Archive Page URL and Testimonials Page URL slugs don't conflict any other Page or custom post type URL slugs
• It's possible you have a page or another custom post type entry with the slug `testimonial`. Change that item's slug and you'll be fine.
• If you've deleted a Page or custom post type with the slug `testimonial`, make sure you've completely Trashed it. Otherwise, slugs in the trash still bug your site.
• Example: Don't have a page named "Testimonials" which creates the page URL slug "testimonials" and set the Testimonials Archive or Testimonial Page URL to "testimonials".

#4 Still Stuck?

• This isn't  good. Please try How do you debug common issues?.
• You sure you have testimonials to show? See this.

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