This doesn't make much sense either, but I looked up faille and found:

1 faille Noun, feminine (a) (Geog) fault
(b) (fig) flaw, weakness, loophole;

The form faille could be from the subjunctive of the verb falloir
falloir
Verb (a) to take, require time, an amount of money

I thought pre might be, well, a prefix. It would mean the same as it does in English.