I'm trying to use graphviz addon by Oleg Kobchenko in J602. After Package 
Manager successfully completed the installation, I run bin\install.bat and 
then, in J console,

load 'graphics/graphviz'
graphview 'G{a->b',LF,'}'

The error message is:

|value error: spawn
|   out=.y     spawn(jpath ADDONDIR,'bin\',PROG),' ',cmdline


What could be wrong with this?

Thank you,

Alexander
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