The apex class EmailLeadReplyCreateTask failed due to: System.StringException: Ending position out of bounds: 15

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The attached email could not be processed because the Apex class EmailLeadReplyCreateTask failed.

System.StringException: Ending position out of bounds: 15

Class.EmailLeadReplyCreateTask.handleInboundEmail: line 28, column 1

global class EmailLeadReplyCreateTask implements Messaging.InboundEmailHandler {
 
  global Messaging.InboundEmailResult handleInboundEmail(Messaging.inboundEmail email, 
                                                       Messaging.InboundEnvelope env){
 
    // Create an InboundEmailResult object for returning the result of the 
    // Apex Email Service
    Messaging.InboundEmailResult result = new Messaging.InboundEmailResult();
  
    String myPlainText= '';
    
    // Add the email plain text into the local variable 
    myPlainText = email.plainTextBody;
    System.debug(myPlainText ); 
   
    // New Task object to be created
    Task[] newTask = new Task[0];
  
    // Try to look up any Leads based on the email from address
    // If there is more than one Lead with the same email address,
    // an exception will be thrown and the catch statement will be called.
    try {
    
        String  relatedRecordId = myPlainText.subStringAfter('RecordId:-');
        System.debug('Lead Id:' + relatedRecordId); 
          
        relatedRecordId = relatedRecordId.trim();
        relatedRecordId = relatedRecordId.substring(0,15);
    
      Lead vLead = [SELECT Id, Name, Email
        FROM Lead
        WHERE Id = : relatedRecordId
        LIMIT 1];
      
      // Add a new Task to the lead record we just found above.
      newTask.add(new Task(Description =  myPlainText,
           Priority = 'Normal',
           Status = 'Inbound Email',
           Subject = email.subject,
           WhoId = vLead.Id));
     
     // Insert the new Task 
     insert newTask;    
     
     System.debug('New Task Object: ' + newTask );   
    }
    // If an exception occurs when the query accesses 
    // the Lead record, a QueryException is called.
    // The exception is written to the Apex debug log.
   catch (QueryException e) {
       System.debug('Query Issue: ' + e);
   }
   
   // Set the result to true. No need to send an email back to the user 
   // with an error message
   result.success = true;
   
   // Return the result for the Apex Email Service
   return result;
  }
}