Argg!! You're right, I have my missing file check looking for the lookup files instead of the ones in the text folder!!
Thanks, I'll use these to find the problem. We're you using a BI or RTW based mod for these files.I'll post the files as soon as I get a chance.
EDIT:
Here are the files I was using when I got the first error. I was using a slightly different set when I got the second, though it may be that the first error is covering the second.