Hello and welcome to Remedial Lace Knitting 101. Everyone go ahead and open your textbooks to the chapter on Why Mistakes Cannot Be Ignored.
If you've already ignored a mistake in line 34 and went right on blithely knitting up to line 78 figuring it would all work itself out somehow, raise your hand.
Okay. Now, has anyone made it line 78 and become so freaking pleased with yourself that you removed all previous lifelines, making it impossible to safely rip back your work in a controlled manner?
*yes, that would be me*
Riiiight. Well, did you at least manage to salvage any of the work you did prior to the mistake row?
*looks sadly at bare, empty needles and pile of unraveled yarn at feet*
You have much to learn, Grasshopper.