Looks like you selected a tab to where there is no proper file selected in the path settings
 
Yes correct the file path for you game client and be sure you have the UOP files in your game client
 
Used to happen to mine, and I lived with it for a wile, when you get the error click Continue, then go back to the Start tab, then click Items again - the tab will now be working, but will have broken the search button.

I believe the error happens because this version of Fiddler is trying to load 65,535 items, when it should be reading 49,151 entries, starting at ID offset 16384 to skip land blocks.

I did manage to fix my by accident, simply by clicking "reload paths" in the options. I also manually typed out the path in the very top box and applied that to all of the files. After that, it has been running like a dream with full UOP support.
 
Yeah mine seems fully functional now. I want to use it to do a merge on tiledata.mul (there is a really cool script that lets you ride a demon among other things) but I am completely clueless as to how the .mul and .uop files work, especially with merging.
 
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