Getting a Null Pointer Exception while saving a workbook

Hi ,

I am getting below exception while saving a worksheet.

java.lang.NullPointerException: null
at com.aspose.cells.zih.(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.WorksheetCollection.a(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.zrd.o(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.zrd.(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.ze.b(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.zxt.b(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.ze.a_(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.zxt.a(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.Workbook.a(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.Workbook.save(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.aspose.cells.Workbook.save(Unknown Source) ~[aspose-cells-19.12.jar!/:na]
at com.ibm.pmo.projects.amerisource.PMOABCResolutionSLOReport.populateSLOBreachData(PMOABCResolutionSLOReport.java:130)PMOAsposeService.zip (28.7 KB)

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