GhostView 3.6 comes up with an error messagebox if I try to load the postscript file generated by dot.exe

---.ps fragment--- %%BeginSetup

-- schnipp--

%%EndResource %%EndSetup
Input:

digraph display_switches {
node [fontname=Helvetica];ratio=auto;rankdir=LR;size ="7.5,7.5";"display_switches.c" [shape=box];
 node [fontcolor=navy,color=beige,style=filled];node [color=lightgrey];
"display_switches.c" -> "prepc.h" [color=coral,label="not found"];
node [shape=ellipse];
 node [fontcolor=black,color=ivory,style=filled];node [color=lightgrey];
"display_switches.c" -> "display_switches.h" [color=coral,label="not found"];
node [shape=ellipse];
 node [fontcolor=black,color=ivory,style=filled];node [color=lightgrey];
"display_switches.c" -> "common_defs.h" [color=coral,label="not found"];
node [shape=ellipse];
}