Question: Plotting ODE's with Maple (plot and DEplot)

So I have something like this:

> with(student);
> with(plots);
> with(plottools);
> with(DEtools);

 

Everything works fine until the DEplot command. It ends up looking like this:

http://postimage.org/image/sjjsv069b/ef923e0d/

Any idea what I entered incorrectly or how to fix it?

Thanks

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