Title: Button: Set a valid document source
Last modified: July 21, 2026

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# Button: Set a valid document source

 *  [neilthorne](https://wordpress.org/support/users/neilthorne/)
 * (@neilthorne)
 * [20 hours, 57 minutes ago](https://wordpress.org/support/topic/button-set-a-valid-document-source/)
 * I have created a button using HTML and while the button works and opens the flipbook,
   it shows an error within the button below the text that reads “Error: Set a Valid
   Document Source.” There is nothing wrong that I can tell that is covered in the
   PDF Not Loading! document.
 * Here is the code:
 *     ```wp-block-code
       <div class="_df_button" source="https://neighbur.net/wp-content/uploads/2026/07/NEIG_JUL26_150.pdf">View July 2026 Edition</div>
       ```
   
 * Thanks!

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 * 0 replies
 * 1 participant
 * Last reply from: [neilthorne](https://wordpress.org/support/users/neilthorne/)
 * Last activity: [20 hours, 57 minutes ago](https://wordpress.org/support/topic/button-set-a-valid-document-source/)
 * Status: not resolved