Hi,
You seem to have uploaded the wrong version of includes/functions/html_output.php or uploaded it to the "wrong" directory - I'm afraid I must warn you to be more careful in future!
Remember there are two directories which have a file of that name:
admin/includes/functions/html_output.php
includes/functions/html_output.php
You should copy the original files across from a fresh installation of Zen Cart then copy across any modifications you need for the other modules you have installed, using software such as Beyond Compare or WinMerge, before finally copying across the modifications you need for URI Mapping.
If you are uncertain about what any of that means then you should probably pay someone else to do this for you.
Hope that helps!
All the best...
Conor
ceon
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