Addon installation problem on GrassGIS

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I am facing a problem with GrassGis 7.0.1. I want to install r.viewshed.cva form Addons. I don't get an error during installation but when I try to open the plugin I get the error :

ScriptErrorUnable to fetch interface description for command'r.vieshed.cva'.Details:Can anyone help me? I am on windows



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