Are you sure you were previously running 5.4.0.5? The file referenced in the error message seems to have disappeared with the 5.3.3 release.

-Steve

make sure all files were uploaded, that is usually what causes errors

Had the same error and i had uploaded all files. Solution for me was:

- Rename the concrete folder for Backup
- Copy the new 5.4.1 concrete folder and now it works.

Something is strange maybe a problem with a old file?

My error was:

I experienced the same thing with a simplescripts installation. Erroring all over the shop.

Also, new installs dont seem to play nicely - images missing, page types missing and un-editable via the c5 gui...

@Hugzy i do a manual update. I do always a manual update - it works better and you have the control.

Try a manual update follow the INSTALL readme. When you have the error above rename or delete the /concrete folder and copy the new one from 5.4.1 to /concrete

Bevor make a backup of the DB and the /concrete folder.

I had also a problem with the slideshow blocks because i had a modified view.php in my /blocks/slideshow/template folder. Check if you have some "old" view.php or controller.php files for customation there. Rename it and replace it with the new files...