Question:Titan create image error

[18840824421]

I have followed the steps to install titan,and when I want to use Titan followed the tutorial, there is some error：
This is my code:
gremlin> g = TitanFactory.open('conf/titan-hbase-es.properties')
The error is:
No such property: TitanFactory for class: groovysh_evaluate

I want to know why is there such a mistake and how can I solve this error?