I was attempting to enable system caching and immediately afterwards this error is the ONLY thing to appear on my site now:

"Fatal error: Class 'FPSSHelperSlideshow' not found in /home/landmark/public_html/modules/mod_fpss/mod_fpss.php on line 23"

I disabled FPSS module and the site works, but FPSS is for some unknown reason broken.

System cache is currently not enabled, and still FPSS will not return to functioning properly.

I use Joomla 1.7.0.

I tried reinstalling FPSS, but I get an error that the installation package cannot be located.

I uploaded the package to a directory to install from directory and got this error:
"JInstaller: :Install: Cannot find XML setup file
        Path does not have a valid package."

Try this solution please:
forum.joomlaworks.net/frontpage-slideshow-%28for-joomla!%29/%27jmodel%27-not-found/msg59893/#msg59893

I have exactly the same problem.

I have tried the addition of

to /components/com_fpss/helpers/slideshow.php

but it still remains.

Please can you let me know how to resolve this

Thanks

Please provide us a link to your site.

I've sent you a PM with the  details

Thanks

We will release a new version with a fix for this. Until then you can solve the issue by changing the line 23 at /modules/mod_fpss/mod_fpss.php
from :to: