Apllication getting crash at "axisSet.xAxis.title=@"Month";"
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please help me in finding out the reason for above said crash.



	CPTXYAxisSet *axisSet =(CPTXYAxisSet *)graph.axisSet;
	axisSet.xAxis.majorIntervalLength = [ [ NSDecimalNumber decimalNumberWithString:@"10.0" ] decimalValue];
	axisSet.xAxis.minorTicksPerInterval = 0;
	axisSet.xAxis.majorTickLineStyle = lineStyle;
	axisSet.xAxis.minorTickLineStyle = lineStyle;
	axisSet.xAxis.axisLineStyle = lineStyle;
	axisSet.xAxis.titleTextStyle=[CPTTextStyle textStyle];
    axisSet.xAxis.title=@"Month";
	axisSet.xAxis.titleLocation = CPTDecimalFromFloat(35.0f);
	axisSet.xAxis.titleOffset =15.0f;
	axisSet.xAxis.labelingPolicy = CPTAxisLabelingPolicyNone;
	axisSet.xAxis.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0");
