Blackberry Source not found for XYRect.union

Blackberry Source not found for XYRect.union

I have a StackOverflowError when debugging app on device.. It says Source
not found and highlighting the line that says XYRect.union(int, int, int,
int) line 555.. I have no idea how to fix it... Could anyone please
explain me what does it mean and where to look for that problem... Thanks
This function appears first as the one that is actually in my code:
public void updateBluetoothDataCount(int newTotal)
{
debug("main run gui");
stringItem_DataCountBluetooth.setText("\n" + getReceivedString() + ":
" + dataCountToHuman(newTotal));
}
Stack:
Thread [MainActivity(333)id=456335360] (Running)
Thread [MainActivity(333)id=465669120] (Suspended (exception
StackOverflowError))
XYRect.union(int, int, int, int) line: 555
MIDPScreen(Screen).invalidateCommon(int, int, int, int, XYRect) line: 2930
MIDPScreen(Screen).invalidateInternal(int, int, int, int) line: 2830
MIDPScreen(Screen).invalidate(int, int, int, int) line: 2854
VerticalFieldManager(Field).invalidateCommon(int, int, int, int, XYRect)
line: 3050
VerticalFieldManager(Field).invalidate(int, int, int, int) line: 2981
VerticalFieldManager(Manager).invalidate(int, int, int, int) line: 2267
MIDPLayoutManager(Field).invalidateCommon(int, int, int, int, XYRect)
line: 3050
MIDPLayoutManager(Field).invalidate(int, int, int, int) line: 2981
MIDPLayoutManager(Manager).invalidate(int, int, int, int) line: 2267
RichTextField(Field).invalidateCommon(int, int, int, int, XYRect) line: 3050
RichTextField(Field).invalidate(int, int, int, int) line: 2981
RichTextField(TextField).update(int, int, int, int, boolean, boolean)
line: 5090
RichTextField(TextField).replace(int, int, AttributedString$Iterator,
long, AttributedString$AttribStoreFilter, int, int, boolean, int, boolean)
line: 7175
RichTextField(TextField).setTextInternal(String, int, boolean) line: 4116
RichTextField(TextField).setText(String, int) line: 4058
RichTextField(TextField).setText(String) line: 4041
RichTextField.setText(String) line: 332
StringItem.updateContents() line: 224
StringItem.setText(String) line: 194
MainRunGUI.updateBluetoothDataCount(int) line: 216
MainActivity.updateTotalBluetoothData(int) line: 284
TaskRunner.bluetoothUpdateBytes(int) line: 485
TaskRunner.bluetoothFileProcessBytes() line: 407
BluetoothIOStream.getVariable(char) line: 725
BluetoothIOStream.getFileBytes() line: 776
Thread.run() line: 379