They are not in conflict, but agreement. What has happened is that Pauls words have been twisted throughout history, beginning in biblical times:
2Pe 3:15 and regard the patience of our Lord as salvation; just as also our beloved brother Paul, according to the wisdom given him, wrote to you,
2Pe 3:16 as also in all his letters, speaking in them of these things, in which are some things hard to understand, which the untaught and unstable distort, as they do also the rest of the Scriptures, to their own destruction.
The untaught and unstable are those who don't understand the law or the covenants...you konw..the ones who think that everything in the books of the old testament are irrelevent. They twist Pauls meanings to mean that man has license to sin under Christ because the law is "done away with". James addresses this, as does Paul.
I've vascillated between wondering if Paul was misquoted, misunderstood, or just made things up as he went along. I have sources (books and websites) that range the spectrum on what to make of his teachings. If you want them, let me know.