Bad Value error with my Google Apps Script to Firebase - firebase

Question

function tree1(){
var secret =SpreadsheetApp.openById('My Database Secret') ;
var sheet = secret.getSheets()[0];
var data = sheet.getDataRange().getValues();
var dataToImport = {};
for(var i = 1; i < data.length; i++) {
var admin = data[i][0];
var email = data[i][1];
var name = data[i][2];
var subject = data[i][3];
var year = data[i][4];
var testone = data[i][5];
var testtwo = data[i][6];
var testthree = data[i][7];
var average = data[i][8];
var progress = data[i][9];
dataToImport[email] = {
name:name,
emailAddress:email,
adminNo:admin,
Subject:subject,
Year:year,
testOne:testone,
testTwo:testtwo,
testThree:testthree,
Average:average,
Progress:progress
};
}
var firebaseUrl = "My Database URL";
var base = FirebaseApp.getDatabaseByUrl(firebaseUrl);
base.setData("", dataToImport);
}
I am attempting to use a Google Sheet App script to sync basic data for my users, using their email address as a reference.
So that when a user logs in with their email they can access test scores that the admin has.
The Database structure I would like is fairly simple that the three scores and other details are a child of the email, as you can see above.
However every time I attempt to complete the script I receive a Bad Value error.
Any ideas as to how I can remedy this problem.
Thank you in advance.