Iguanatex and tikz in powerpoint, problem computing bounding box

I am trying to use iguanatex in powerpoint to draw a tikz picture with the following code

documentclass{article}
usepackage{amsmath}
usepackage{amssymb}
usepackage{cmbright}
usepackage{color}
usepackage{tikz}

definecolor{MOOCblue}{RGB}{8,138,224}
definecolor{MOOCgreen}{RGB}{40,159,56}
definecolor{MOOCdarkblue}{RGB}{32,39,79}
definecolor{MOOCorange}{RGB}{240,98,23}

newcommand{prob}[1]{ensuremath{{rm P}left( #1 right)}}

pagestyle{empty}
begin{document}
begin{tikzpicture}[scale=0.65]
draw (-2,0) -- (2,0) ;
draw (0,-2) -- (0,2) ;

draw[MOOCblue, thick] (0,0) -- (0,1) -- (1,2) -- (2,1) -- (2,0) -- cycle ;
draw[MOOCblue, thick] (1,0) -- (1,1) -- (1.5,1) -- (1.5,0) ;



end{tikzpicture}


end{document}

In fact I am trying to edit this code and I have got a powerpoint slide with the executed code on it already. However even when I change nothing and try to regenerate the code I get the error:

Error while using Ghostscript to compute the bounding box. Is your path correct?

Does anyone have an idea what is going wrong here?

Thanks in advance