Until someone who can actually understand that error (Ben) can take a look, try clicking on the Update Album Files link on the main Backlight dashboard. Might not hurt to try clearing template cache too.
Is this happening in every album?
Are you using Backlight Publisher or Lightroom Publisher to publish the images?
@Daniel’s solution is kind of right, but ultimately this is a bug in BL3. The code should be trying to check the filesize of the local file, and not a file via an external URL.
I addressed this error (or at least one occurrence of it, in case you have encountered another). Are your Backlight Modules up-to-date? Can you try visiting Backlight Modules and updating to modules that have updates?
Thanks a lot for your answers!
Channging of PHP versions did nothing.
In which directory must I save the php.ini?
Does the php.ini contain only the following line?
allow_url_fopen = on
Could I alternatively simply hide the error message via CSS?
Do as Ben suggested first, there may be no need to edit php.ini.
If there is, then the php.ini file, if your site has one, resides in the root of the site.
I’m not sure that it’s safe to create a php.ini file with just that code in it. I don’t think I should be able to click on that link and see the contents. That may make it vulnerable to hackers. Plus, there is a whole lot of other code in there that may be needed to make settings work.
If your site didn’t previously have a php.ini file, then you may be able to have it created from within your C-panel. If I remember correctly, mine was created when I updated the php version of my site from the PHP Config section of my Cpanel. But it’s been a while.
try Googling on your host name plus php.ini. e.g. “bluehost php.ini”