java.lang.IllegalArgumentException: Vertex constraints only apply to edges
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java.lang.IllegalArgumentException: Vertex constraints only apply to edges
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122)
at com.thinkaurelius.titan.graphdb.query.vertex.BasicVertexCentricQueryBuilder.constructQueryWithoutProfile(BasicVertexCentricQueryBuilder.java:393)
at com.thinkaurelius.titan.graphdb.query.vertex.BasicVertexCentricQueryBuilder.constructQuery(BasicVertexCentricQueryBuilder.java:385)
at com.thinkaurelius.titan.graphdb.query.vertex.VertexCentricQueryBuilder.execute(VertexCentricQueryBuilder.java:59)
at com.thinkaurelius.titan.graphdb.query.vertex.VertexCentricQueryBuilder.relations(VertexCentricQueryBuilder.java:98)
at com.thinkaurelius.titan.core.TitanVertexQuery.count(TitanVertexQuery.java:105)