I have seen question on here regarding a citation error in a paper here: What should I do if I found a citation error in a published paper?, but the nature of this problem is very different.
Basically, I came across an error in a paper (call this error 2).
I have previously contacted the author before regarding a different problem (call this error 1, say) in this paper, and I got no response. (That was what I still believe to be an unproven proposition, and is actually also related to this problem.)
The reason I decided to ask here this time is the following:
I am highly confident about error 2.
Its correctness has a direct impact on my current research.
The mistake cannot be easily fixed. (At least it appears to me, for the time being). I have spent months on a related problem before revisiting this paper and realised that I have tried this same technique in problem, which did not work in my problem, which led me to check why it worked in his paper - and it turned out, it did not.
The result was probably the first/the only result of its kind in the literature and the paper is fairly important with 150+ citations.
What should I do here? I have previously contacted the author and I have no reason to believe he would respond this time. I want it to be correct/easily patched because of reason 2. This paper was published in 1997 so it has been a while....
EDIT: Precisely for reason 2, I would much prefer some way of getting the author to respond.
EDIT: I had a discussion with my supervisor. He immediately agreed with me it was a mistake. The thing is when we tried to use a similar technique for a different problem, we fell down the same trap about 10 times. At the moment, we have no fix and the mistake is serious enough that it takes away a lot of credit from the paper.