I am about to submit a manuscript in which I point to some methodological errors that I found in some literature. The error may significantly change part of the results and conclusions if those papers.
I thought I should first contact the authors of those papers to discuss the issue with them. Especially, to check if they actually made that mistake or if their methods were not detailed enough.
However, most of the authors that I tried to contact did not answer back (I checked their actual email address) or did not remember the details of their analysis.
What should I do? Am I "allowed" to point to some papers that I repute wrong only on the base of the details given in their method section?