Error running show_graph example

[andreifoldes]

Hello
When running the first example from: https://princetonuniversity.github.io/PsyNeuLink/Visualization.html?highlight=show_graph
I get the following error:

File`` "C:\Users\folde\Anaconda3\lib\site-packages\psyneulink\core\compositions\showgraph.py", line 2278, in _generate_output
    G.view(composition.name.replace(" ", "-"), cleanup=True, directory='show_graph 'OUTPUT/PDFS')

File "C:\Users\folde\Anaconda3\lib\site-packages\graphviz\files.py", line 242, in view
    quiet=quiet, `quiet_view=quiet_view)

  File "C:\Users\folde\Anaconda3\lib\site-packages\graphviz\files.py", line 209, in render
    quiet=quiet)

  File "C:\Users\folde\Anaconda3\lib\site-packages\graphviz\backend.py", line 221, in render
    run(cmd, capture_output=True, cwd=cwd, check=True, quiet=quiet)

  File "C:\Users\folde\Anaconda3\lib\site-packages\graphviz\backend.py", line 184, in run
    output=out, stderr=err)

CalledProcessError: Command '['dot', '-Tpdf', '-O', 'Composition-2']' returned non-zero exit status 1. [stderr: b'Format: "pdf" not recognized. Use one of:\r\n']

[jvesely]

This looks like a problem with graphviz installation.
Potentially a variant of https://gitlab.com/graphviz/graphviz/-/issues/1315

can you run the test in the above bug report in windows cmdline?

echo graph test {} >test.dot
dot.exe test.dot -Tpdf -o test.pdf