Trying to create a new User, cannot create new user because of profileID

Question

I am trying to create a new user inside of Salesforce using nforce. However, every time I create the user I get the error: FIELD_INTEGRITY_EXCEPTION stating Profile ID: id value of incorrect type: 005210026VpWAAUAQ4 or I receive INVALID_CROSS_REFERENCE_KEY with a message of invalid cross reference id. Which message I receive depends on the value I have set for profileId, 005210026VpWAAUAQ4 causes a FIELD_INTEGRITY_EXCEPTION while 00e36000000YIZ6AAO causes an INVALID_CROSS_REFERENCE_KEY. Any ideas on how to solve the errors and create a new user?

var acc = nforce.createSObject('User');
acc.set('ProfileId', '00e36000000YIZ6AAO'); // throws error here

Answer 1

After lots of help from the community, I realized new users in salesforce have to be tied to a profile. Unfortunately, I was not aware profiles and users were different objects in Salesforce.

My Solution:

var q = "SELECT Id FROM Profile WHERE Name = 'Test_Profile'";

org.query({
            query: q
        }, function(err, resp) {
            var acc = nforce.createSObject('User');
            acc.set('ProfileId', resp.records[0]._fields.id);

            org.insert({
                sobject: acc
            }, function(err, resp) {
                if (!err) 
                    console.log('It worked!');
                else
                    console.log(err);
            });

        });