Lop should be created as a "software" and not a "person"

In the section "The Next Fifteen Minutes", specifically in the sub-section "Creating a Graph", at two places, you've the command:

v2 = g.addV("person").property(id, 3).property("name", "lop").property("lang", "java").next()

but it should be

v2 = g.addV("software").property(id, 3).property("name", "lop").property("lang", "java").next()

Due to this typo, it could be difficult to understand why later you're speaking about "Walk along the "created" edges to "software" vertices" as we never created a software.