Egg Box of a semigroup in GAP

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How can I draw the egg box of D class of a semigroup with GAP. I used function DrawDClasses(S,"DClasses"), but it does not work and it asks me to install gsviwer but I already have gsviwer on my system.

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Perhaps worth to answer here, since GAP Forum will not permit attachment. For me, the process described in the manual and GAP Forum works perfectly: I have graphviz installed, and after

LoadPackage("semigroups");
S:=FullTransformationSemigroup(3);
Splash(DotDClasses(S));

I see the following picture (opened in my tool to view PDFs):

enter image description here

The explanation why it does not work for you and how to make it working depends on your operating system, the software you have, and the way you've installed it - such discussion is out of scope for this site, and I would not be surprised if this question will be closed in the future. I suggest to contact GAP Support telling details of your operating system and providing exact input and output in your case, and I hope that we will be able to help.