I have an A0 poster in beamer which I'm trying to create some of my own colors for, however my code refuses to acknowledge \definecolor . Here is my full preamble which compiles fine when the definecolor and setbeamercolor lines are commented out and produces the error when they're included.






\setbeamertemplate{navigation symbols}{}

\font\titlefont=cmr12 at 105pt
\font\authorfont=cmr12 at 40pt
\font\institutefont=cmr12 at 40pt

\setbeamercolor{background canvas}{blue}



The specific error I'm getting is "Package keyval error: blue undefined", I can only guess there is some conflict in the packages I have installed somewhere but I haven't been able to find out what.


syntax wrong - correct:

\setbeamercolor{background canvas}{bg=blue}

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