Remov geometry package, as not required

header.tex

@@ -64,9 +64,6 @@ ngerman,	% it's a german document
 \allsectionsfont{\rmfamily}
 \chaptertitlefont{\rmfamily\hspace*{0.5em}}
 
-% Custom side marings
-\usepackage{geometry}
-
 % Zeilenabstand 1.5
 \usepackage[onehalfspacing]{setspace}