From the hosting support are sendind this answer:
[11-Aug-2021 11:26:30 UTC] PHP Warning: strtoupper() expects parameter 1 to be string, array given in /home/bimaulac/public_html/bimaula.com/learninghub/wp-content/plugins/sensei-certificates/lib/tfpdf/tFPDF/PDF.php on line 1151
Hi @daniellacarra ,
> The message seems to have origin on the pdf creation: “The file can’t be opened”
Have the certificates ever been generated correctly? If so, what changed between then and them not working? Plugin updates, etc?
What versions of Sense LMS and Certificates are you using? Make sure you’re updated to the most current (3.12.0 and 2.2.0, respectively) versions.
If the plugins are up to date, I’d next test for theme or plugin conflicts.
I’d suggest setting up a staging site first. Many hosts provide a staging service, where you can do testing without affecting the live site. You can ask your host about this. If they don’t give you a staging site, you could try WP Staging or Duplicator:
https://wordpress.org/plugins/wp-staging/
https://wordpress.org/plugins/duplicator/
Next, test for conflicts.
Try disabling all of your plugins except Sensei LMS (and extensions). Then try testing again to see if the issue persists. If that resolves your issue, you can find what was causing it by enabling each plugin one by one while continuing to test.
If that doesn’t help, you can also try switching to the Twenty Twenty theme via Appearance > Themes, and test again. If the issue is resolved then you know it’s a problem with the theme, and you’ll need to contact the theme author for further assistance.
Let us know what you find.
Best,
Cena
Hi there,
Since it’s been some time since you last replied, I will mark this thread resolved.
Please feel free to create a new thread if you still need help!
Best,
Cena
