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http://protege.stanford.edu/doc/owl-faq.html#dot_errorÉÏÃæÓнâÊÍ: "Why am I getting "An error related to DOT has occurred" when trying to use the OWLViz plug-in? If you are trying to use the OWLViz plug-in, and you see the following error message: ... it means that you have not successfully completed two of the steps necessary for properly configuring OWLViz. You must do the following in order for the plug-in to work: Download and install a copy of Graphviz, which is a free, open source graph visualization software from AT&T Research. On the OWLViz tab, click the Options button to bring up the Options dialog. On the Layout Options panel, specify the path to the location of the DOT executable. The panel will look something like the following screenshot: "