if ([nMembersInput intValue] == 0)
	{
		NSAlert *alert = [[NSAlert alloc] init];
		[alert addButtonWithTitle:@"OK"];
		[alert setMessageText:@"Fehlerhafte Daten."];
		[alert setInformativeText:@"Es muss mindestens einen Lösungskandidaten geben."];
		[alert setAlertStyle:NSWarningAlertStyle];
	
		[alert beginSheetModalForWindow:MeWindow modalDelegate:self didEndSelector:@selector(alertHandler:returnCode:contextInfo:) contextInfo:nil];
	
		[alert release];
		return;
	}
	if ([intervalText intValue] == 0)
	{
		NSAlert *alert = [[NSAlert alloc] init];
		[alert addButtonWithTitle:@"OK"];
		[alert setMessageText:@"Fehlerhafte Daten."];
		[alert setInformativeText:@"Das Intervall muss größer als 0 sein."];
		[alert setAlertStyle:NSWarningAlertStyle];
		
		[alert beginSheetModalForWindow:MeWindow modalDelegate:self didEndSelector:@selector(alertHandler:returnCode:contextInfo:) contextInfo:nil];
		
		[alert release];
		return;
	}