[RESOLVED] Problem Editing Text File

[Edgemeal]

The error happens at this time:

lines.count = 109517
line = 109517

Changing the for loop to : 0 to 109516 solves the problem, but in the future, how should I approach this?
Thanks

Collections are zero indexed based, so the first element is at index 0,
For line = 0 To
,and the last element is equal to the count minus one,
For line = 0 To (lines.Count - 1)