[Tex/LaTex] Package keyval Error: letter undefined


I have no idea what's causing this, I have about 1800 lines of code, and no idea where the problem is. Could someone explain what the keyval package is, and what this error could possibly mean?

Best Answer

Found the problem, had

\usepackage[letter, margin=1.5in, top=1.5in, bottom=1.5in]{geometry}

Removing "letter" from the package options fixed it