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I am trying to complete the challenge for the Use Org & Session Cache module on Salesforce Trailhead. Here are the instructions:

In this challenge, you’ll write an Apex class that writes and reads a bus schedule from the org cache. Your method for reading the cache has to handle cache misses.
  • Create a partition called BusSchedule with 0 MB for the size of org cache and session cache. The 0 MB allocation enables you to test cache misses.
  • Create a public Apex class called BusScheduleCache.
  • Add this variable to the class: private Cache.OrgPartition part;
  • In the constructor, create a new instance of Cache.OrgPartition by passing it the partition name (local.BusSchedule). Assign this object to the class variable (part).
  • Add two public methods. a. The first method, putSchedule(), returns void and takes these parameters: String busLine, Time[] schedule. b. The second method, getSchedule(), returns a bus schedule as a time array (Time[]) and takes this parameter: String busLine.
  • Implement the putSchedule() method so that it stores the passed-in values in the org cache by using the partition class variable (part).
  • Implement the getSchedule() method so that it returns the schedule for the specified bus line by using the partition class variable (part).
  • Add logic to the getSchedule() method to handle cache misses. If null is returned for the cached value, getSchedule() should return the following default schedule as a Time array with two Time objects: one Time object value of 8am and another of 5pm. Use the Apex Time.newInstance() method to create the Time objects.
Here is my current code:
public class BusScheduleCache {   
    // Get partition
    private Cache.OrgPartition part;
    String partitionName = 'local.BusSchedule';
    public BusScheduleCache(String partitionName) {
		Cache.OrgPartition newpart = Cache.Org.getPartition(partitionName);
        part = newpart;
    public static void putSchedule(String busLine, Time[] schedule) {
        Cache.Org.put(busline, schedule);
    public static Time[] getSchedule(String busLine) {
        Time[] schedule;
        // Get a cached value
		Object obj = Cache.Org.get(busLine);
		// Cast return value to a specific data type
		Time t2 = (Time)obj;
        if (t2 != null) {
        else {
            Time t3 = Time.newInstance(8,0,0,0);
            Time t4 = Time.newInstance(17,0,0,0);
        return schedule;

Here is the error I am receiving:

Challenge Not yet complete... here's what's wrong: 
The Apex Class BusScheduleCache is not properly implemented. Please follow the requirements and ensure everything is setup correctly

Can someone please help?