in reply to
I think 'grep' utility can help you to pump out occurrences of the error to a separate file.
there is grep for windows available.
Store the line number, when you are about to start checking at the same line where you left.(grep doesn't give this feature to start searching from a particular line number, so almut solution is best fit)
-- In accordance with the prarabdha of each, the One whose function it is to ordain makes each to act. What will not happen will never happen, whatever effort one may put forth. And what will happen will not fail to happen, however much one may seek to prevent it. This is certain. The part of wisdom therefore is to stay quiet.