db.col.insertMany(
    [
        {
        "_id" : "tt0084726",
        "title" : "Star Trek II: The Wrath of Khan",
        "year" : 1982,
        "type" : "movie"
        },
        {
        "_id" : "tt0796366",
        "title" : "Star Trek",
        "year" : 2009,
        "type" : "movie"
        },
        {
        "_id" : "tt0084726",
        "title" : "Star Trek II: The Wrath of Khan",
        "year" : 1982,
        "type" : "movie"
        }
    ]
);

操作系统：LinuxMint 17.3罗莎·蒙戈数据库：数据库版本v2.6.12
我正在参加University of MongoDB的一个课程，当我在mongo shell中输入上面的命令时，出现了一个错误：TypeError: Property 'insertMany' of object test.col is not a function怎么解决？我看了文档，还是不行。