I currently have a trigger "UpdateInTouchLead" shown below: 

trigger UpdateInTouchLead on Task (after insert, after update) {
Set<String> whoIds = new Set<String>();
	
    for (Task t : Trigger.new) {
  		whoIds.add(t.WhoId);
	}
	
   	List<Lead> leads = [SELECT Id, First_in_touch__c FROM Lead WHERE Id =: whoIds];
    
   	Map<String, Task> taskMap = new Map<String, Task>();
	
    for (Task t : Trigger.new){
    	if (!(t.Type.equals('Eloqua Activity'))) {
    		if (t.Status.equals('Completed')) {
    			taskMap.put(t.WhoId, t);
    		}
    	}
	}
         
    for (Lead l : leads) {
  		if (taskMap.containsKey(l.Id)) {
  			System.debug('Activity Date: ' + taskMap.get(l.Id).ActivityDate); 
  			System.debug('First In Touch before: ' + l.First_in_touch__c); 
  			l.First_in_touch__c = taskMap.get(l.Id).ActivityDate;
  			System.debug('First In Touch after: ' + l.First_in_touch__c); 
			l.Status = 'In Touch';
			l.POC_Communications__c = 'Muted'; 
   		}
	}
	update leads;
}

This trigger runs whenever a Task in inserted or updated, but I would like to have this trigger also run once a day (at midnight). I have tried creating a scheduled class but I am receiving the folowing error:  "Invalid Type: UpdateInTouchLead". 

The schedulable class is shown below: 

global class scheduledUpdateInTouchLead implements Schedulable {
global static void scheduleMe()
  {
    scheduledUpdateInTouchLead msc = new scheduledUpdateInTouchLead();
    String sch = '0 00 00 * * ?'; // everyday at midnight
    String jobID = System.schedule('Scheduled Job', sch, msc);

  }

  global void execute(SchedulableContext sc)
  {
	UpdateInTouchLead u = new UpdateInTouchLead();
  }
}

Any advice on how to fix this is appreciated.