I have this nested functions but it only called the first 2 functions and then skipped the others. Add it is too fast to redirect to another page. What I wanted to achieve is this and making sure that every instances finishes its job before proceeding to another instances:

Scenario:
First instance // first called
Sec instance // next called then
Third instance // next called then
Fourth instance // last called

So this is what I did:

function creacteAccount(db_name, contact, email) {
    if (!(db_name > "" && contact > "" && email > "")) {
        return Promise.reject("One of the parameters is empty");
    }
    return session.rpc('/custom/createdb', {db_name: db_name})                  
        .then(function () {
            console.log("Database created successfully");
            return session.rpc('/custom/initdb', {db_name: db_name});           
        }).then(function () {
            console.log("Database initialized successfully");
            return session.rpc('/custom/installapps', {db_name: db_name});      
        }).then(function () {
            console.log("Apps installed successfully");
            return session.rpc('/custom/createaccount', {                      
                db_name : db_name, 
                contact_name: contact, 
                email_from: email
            });
        }).then(function () {
            console.log("User account created successfully");
        });
}
creacteAccount(db_name, contact, email).then(function () {
    console.log("Successfully creating your account")
}).catch(function (err) {
    alert("Could not create account! (" + err + ")");
});

Then this is the error displayed in my console:
> Uncaught TypeError: creacteAccount(...).then(...).catch is not a function