jkwp

Solved it myself meanwhile.
1. The above happens when you try to embed a pdf file uploaded with the “Download Monitor” plugin.
2. In addition to that there seem to be problems with url paths WordPress 5.1.1 comes up with when selecting the file. However, at present I don’t have the time to investigate that in detail.

Disregard – looks like it is a conflict with the very old ‘PHP Shortcode’ plugin, used along with an old Atahualpa template.

Yes, it’s solved. I had the same problem again last week and in both cases it was due to loss of a htaccess file which instructs the server to load php 5.3 instead of the server’s default php 5.2.

I’m puzzled. That error should only occur with versions of PHP older than 5.3

Maybe that was the issue. I rechecked the php version in use. The server provides php 5.2 by default, but allows to load php 5.3 via a .htaccess file, which I’m using. When I checked it, for some reason the content of the .htaccess file was deleted.

At present I don’t have an idea how this happened.

Can you try to replace all occurrences of “static::” on options.class.php, with “self::”?

I didn’t try this yet. First thing I did was to rebuild the .htaccess file and after doing that, the site seems to work normal again. Will let you know if the issue shows up again.

Meanwhile, can you please tell me which version of WordPress you are using?

Happened with WP 3.9.1 (also shown on the right side of this page ??
The site is running with php 5.3