Titan IllegalArgumentException：无法实例化实现：com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager

I'm a beginner with Titan Graph Database and I'm just trying to create a simple titan graph in a particular path using eclipse.Initially , setting the titan configurations followed by creating two vertices and an edge. This is the code i had given :I'm a beginner with Titan Graph Database and I'