It was working fine till yesterday. Suddenly its giving me the above error in DEBUG Logs and in Apex jobs page it gives First error: AsyncApexExecutions Limit exceeded.

can some one please help me.
Thanks in advance.

global class DEREDistributer implements Database.Batchable<sObject>, Database.AllowsCallouts,Database.stateful {
  global integer x=0;

global Database.QueryLocator start(Database.BatchableContext BC) {
        String query = 'SELECT Name,Times_The_Lead_Is_Distributed__c,Hawaii__c,SV_Priority_Hidden__c, Id, AssignToUserId_Hidden__c FROM Lead WHERE IsConverted =false and Hawaii__c = false and To_Be_Distributed__c=true and DE_Synched__c=true and Is_Distributed__c =True ';
        return Database.getQueryLocator(query);
    }
  global void execute(Database.BatchableContext BC, List<Lead> scope) {
  List<Team1__c> L1 = [SELECT Name,CheckIn__c From Team1__c Where CheckIn__c = True]; 
  integer i = L1.size();
integer z=1;

//Initialize the AZ Qualification Team   
  for(Team1__c L2 :[SELECT Name,CheckIn__c,UserId__c From Team1__c] )
  {
  If(L2.CheckIn__c == True)
    {
     L2.UserId__c = z++;
     update L2;
     }
  else
  {
  L2.UserId__c =0;
  update L2;
  }  
  }
  for (Lead e : scope) {
 
//assingn user id,distribution count and distributed flag.   
  x++;
  decimal y =  e.Times_The_Lead_Is_Distributed__c;
  e.AssignToUserId_Hidden__c = math.MOD(x, i) + 1;
  e.Is_Distributed__c =True;
   e.Times_The_Lead_Is_Distributed__c = y +1;

      Update scope;
      }
      } 
  global void finish(Database.BatchableContext BC) { }
  }