Unknown Exception

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An unknown exception has occurred
/activity/-/activity-379/

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/Users/xpyth/xml/premsela/site_2007/activity/_xsl2/xierpa/shownavigation.xsl
XPythLangError: list index out of range

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0	int(e['eachnode']['project_id']) == int(e['activityproject'][0]['project_id'])

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