6

To change the colour of a page and text you can use the xcolor package: \usepackage{xcolor} \pagecolor{black} \color{white}


2

If you want to get your paper in letter size, please do \documentclass[twocolumns,10pt,letterpaper]{article} If you want to write a letter, you should avoid environments such as abstract as those are not defined for letters.


2

This might be a problem with special characters (e.g. accents) in your .bib file. My problem was solved thanks to this comment, which suggested simply adding \usepackage[T1]{fontenc} to the preamble of the .tex document.


1

It's a good idea to try and remove all unnecessary packages from your MWE; this also can help in identifying package incompatibilities before posting on here. :) Regardless, looking at the mcode.sty file, there doesn't appear to be any package options that are set at the package declaration. Removing these from your provided MWE, I compile correctly - I got ...


1

This issue is that in your custom class you load scrbook with \LoadClass and pass the options there, but you load graphicx using \RequirePackage in your own class. This causes the package loading to be outside the scope of \LoadClass and therefore the option is not passed. You can check this when you uncomment \RequirePackage{graphicx} (and \RequirePackage{...


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