Can I use only one graph in a page ?
From semantic-mediawiki.org
Fragment of a discussion from Help talk:Graph format
The problem is in SRFGraph::getParamDefinitions (SRF_Graph.php). The solution is to change the first instance of "graphsize" to "graphname" in this function (making $params['graphname'] agree with 'srf_paramdesc_graphname').
Opened an issue: https://github.com/SemanticMediaWiki/SemanticResultFormats/issues/43