I used wolfmame 1.52's listXML and I did not get the error message you are getting. ?
I am unable to extract the attachment you supplied here, so I don't know how to help you.
Here's what I did:
1) click setting and tools
2) in the merge utility section, click the MAME ListXML browse button, I browsed to wolfmame152.exe
3) romlister created the listXML.XML file and then put the filename in the listXML box.
4) I then copied this filename into the upper most XML input file field "Input XML file" If you had created a merged XML file with wolfmame's listXML file+catver+controls, this would be done for you after the merge tool was done.
5) Then I clicked on the Set button to return back to the main RL screen. This sets RL up so it knows what your main input XML file is.
6) Now go back into settings and tools.
7) Click the ROM Scan Utility button.

Browse to where you have .zip/.7z roms
9) provide a new filename for your XML file
10) wait. RL will now compare your 7z/.zip files against your input XML file (listXML.XML) and reduce that file down to just the roms that you have in your folder.
11) when finished, RL will put the new filename into the top field for your input XML file. You can now use this file to create any rom lists you need.
Beyond that, if you are having problems I'm not sure if I can help. It worked perfectly for me following these exact steps and wolfMAME 152.