What is worst reason for the errors when fixing your codes please share your experience

Question

I spent 4 hours for fixing the errors in my program for just a wrong spelling of variables so i just thinking what are the worst reason of the other programmers out there

Answer 1

Fortunately, modern IDEs are very good at spotting simple misspellings.
Sometimes it is my logic, where I am mistaking, but more frequently it is just syntax

Answer 2

; and syntax (";" isnt problem once you get used to)