Don't display images in nodes

[covax]

When I try to render network scheme with routers and switches images

{{{
#!graphviz

digraph {  
          Router1 [shape=None, image="router.png", label="123"]  

}}}

GraphvizPlugin displays this error:

Graphviz macro processor has detected an error. Please fix the problem before continuing.

The command:

'/usr/bin/dot -Tpng -o/var/lib/trac/vvoit/www/htdocs/graphviz/fa9e9c350e65749ae95a7d19d054411f549ad7de.dot.png -Gdpi=96'
succeeded but emitted the following output:
'Warning: using box for unknown shape None\nWarning: No such file or directory while opening aaa.png\nWarning: No or improper image="aaa.png" for node "aaa"\n'

How can I display images in nodes?

[Jun Omae]

The dot command said Warning: using box for unknown shape None. I think that should be shape=none, not shape=None.

See ​https://graphviz.gitlab.io/_pages/doc/info/attrs.html#k:shape