
As a fault localization tool, your objective is to identify potential buggy lines within a specific method. The bug was triggered by the test case "org.jfree.data.time.junit.TimeSeriesTests::testBug1864222" and resulted in the following error message: "java.lang.IllegalArgumentException: Requires start <= end.".
To assist you in debugging, the methods that requires attention are:
// Method 0 
1 public TimeSeries createCopy(int start, int end)
2         throws CloneNotSupportedException {
3         if (start < 0) {
4             throw new IllegalArgumentException("Requires start >= 0.");
5         }
6         if (end < start) {
7             throw new IllegalArgumentException("Requires start <= end.");
8         }
9         TimeSeries copy = (TimeSeries) super.clone();
10         copy.data = new java.util.ArrayList();
11         if (this.data.size() > 0) {
12             for (int index = start; index <= end; index++) {
13                 TimeSeriesDataItem item
14                     = (TimeSeriesDataItem) this.data.get(index);
15                 TimeSeriesDataItem clone = (TimeSeriesDataItem) item.clone();
16                 try {
17                     copy.add(clone);
18                 }
19                 catch (SeriesException e) {
20                     e.printStackTrace();
21                 }
22             }
23         }
24         return copy;
25     }
// Method 1 
1 public TimeSeries createCopy(RegularTimePeriod start, RegularTimePeriod end)
2         throws CloneNotSupportedException {
3         if (start == null) {
4             throw new IllegalArgumentException("Null 'start' argument.");
5         }
6         if (end == null) {
7             throw new IllegalArgumentException("Null 'end' argument.");
8         }
9         if (start.compareTo(end) > 0) {
10             throw new IllegalArgumentException(
11                     "Requires start on or before end.");
12         }
13         boolean emptyRange = false;
14         int startIndex = getIndex(start);
15         if (startIndex < 0) {
16             startIndex = -(startIndex + 1);
17             if (startIndex == this.data.size()) {
18                 emptyRange = true;   
19             }
20         }
21         int endIndex = getIndex(end);
22         if (endIndex < 0) {              
23             endIndex = -(endIndex + 1);  
24             endIndex = endIndex - 1;     
25         }
26         if (endIndex < 0) {
27             emptyRange = true;
28         }
29         if (emptyRange) {
30             TimeSeries copy = (TimeSeries) super.