Exception with message "Object reference not set to an instance of an object."

Aspose.Cells Product Family
1
Conversion of one of the file failed while converting excel file to PDF. We are using Aspose.Cells(Ver. 7.1.1.0). Following is the exception we got. Please provide fix asap.

Code snippet:
Workbook workbook=null;
workbook = new Workbook(sourceFilePath);
Aspose.Cells.SaveOptions saveOptions = null;
saveOptions = new Aspose.Cells.XlsSaveOptions();
saveOptions.CachedFileFolder = Path.GetTempPath();
saveOptions.SaveFormat = Aspose.Cells.SaveFormat.Pdf;
if (workbook != null)
workbook.Save(destinationFilePath, saveOptions);

Exception:

3/10/2012 6:50:21 AM
Message: HandlingInstanceID: 069baf80-b961-4741-8cd6-83abe5d90dfd
An exception of type 'System.NullReferenceException' occurred and was caught.
2012-03-10 01:50:21Z
System.NullReferenceException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Object reference not set to an instance of an object.
Aspose.Cells in file: C:\Windows\TEMP\IntraLinks\ff182e3f-1b1d-485e-9167-34067f391463.xls
System.Collections.ListDictionaryInternal
Void (’.„)
at ’.Œ.(„ )
at ’.Œ.Ž(„ )
at ’.Œ.(„ )
at ’.Œ.(MemoryStream )
at ’.Œ.( )
at Aspose.Cells.Workbook.(String , LoadOptions )
at Intralinks.Common.Utilities.AsposeConverter.ConvertXlsToPdf(String sourceFilePath, String destinationFilePath) in c:\ilbuilds\pdfconv\build_trunk\CommonUtilities\AsposeConverter.cs:line 75
at Intralinks.Common.Utilities.CommonUtilities.ConvertOfficeDocsToPDF(String sourceFile, String destinationFolder, Boolean useOriginalFileName) in c:\ilbuilds\pdfconv\build_trunk\CommonUtilities\CommonUtilities.cs:line 1464
Category: Logging Exception
Priority: 1
EventId: 100
Severity: Error
Title:Enterprise Library Exception Handling
Machine: WDPPF01
Application Domain: ILPDFConversionService.exe
Process Id: 2056
Process Name: C:\PDFConvService\WOODDALE.pdfconv\instance1\Release\ILPDFConversionService.exe
Win32 Thread Id: 4920
Thread Name:
Extended Properties: Product Version - 3.1.27217.0

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1/18/2012 4:52:05 AM
Message: HandlingInstanceID: 860fe622-4bd8-45ea-bda9-a6fdad0381b8
An exception of type 'System.NullReferenceException' occurred and was caught.
2012-01-17 23:52:05Z
System.NullReferenceException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Object reference not set to an instance of an object.
Aspose.Cells in file: C:\WINDOWS\TEMP\IntraLinks\8a9d31c4-a579-4469-a1a5-1406784594bc.xls
System.Collections.ListDictionaryInternal
Void x533dee58d7fff4e6()
at x484486ddc8e52eef.x54ec3bed6813979e.x533dee58d7fff4e6()
at x484486ddc8e52eef.x54ec3bed6813979e.x06b0e25aa6ad68a9(xfc686d5bce097028 x1f31bf6ca58166a1, Worksheet x99ecbc7e3ae0e29b, x8b6071c5dcbbf539 x3b41448adea64309)
at x484486ddc8e52eef.xd6c068b9dc379245.x35db41d5b3184c65()
at x484486ddc8e52eef.xd6c068b9dc379245.x06b0e25aa6ad68a9(WorksheetCollection x6d7b41a5fb54bb38, Worksheet x99ecbc7e3ae0e29b, x8b6071c5dcbbf539 xe134235b3526fa75, x508b33aea0611cd1 xcf18e5243f8d5fd3)
at x2e38ab1759381034.x8b6071c5dcbbf539.xbddc206c7dafc24d(x508b33aea0611cd1 xcf18e5243f8d5fd3)
at x2e38ab1759381034.x8b6071c5dcbbf539.x2a9806f9bb2936af(x508b33aea0611cd1 xcf18e5243f8d5fd3)
at x2e38ab1759381034.x8b6071c5dcbbf539.x6b024d3b2b8f9765(MemoryStream xcf18e5243f8d5fd3)
at x2e38ab1759381034.x8b6071c5dcbbf539.x6f3d999f7a817f2d(xd8c3135513b9115b x84378c276c4cd7e2)
at Aspose.Cells.Workbook.Open(Stream stream, FileFormatType type)
at Aspose.Cells.Workbook.Open(String fileName)
at Intralinks.Common.Utilities.AsposeConverter.ConvertXlsToPdf(String sourceFilePath, String destinationFilePath) in c:\ilbuilds\pdfconv\build_trunk\CommonUtilities\AsposeConverter.cs:line 71
at Intralinks.Common.Utilities.CommonUtilities.ConvertOfficeDocsToPDF(String sourceFile, String destinationFolder, Boolean useOriginalFileName) in c:\ilbuilds\pdfconv\build_trunk\CommonUtilities\CommonUtilities.cs:line 1385
Category: Logging Exception
Priority: 1
EventId: 100
Severity: Error
Title:Enterprise Library Exception Handling
Machine: WDPDPF01
Application Domain: ILPDFConversionService.exe
Process Id: 6308
Process Name: C:\PDFConvService\WOODDALE.pdfconv\instance1\Release\ILPDFConversionService.exe
Win32 Thread Id: 4020
Thread Name:
Extended Properties: Product Version - 3.0.24944.0

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2

Hi,

Thanks for your posting and using Aspose.Cells for .NET.

Please download and use the latest version:
Aspose.Cells
for .NET v7.1.2.1
it should fix the problems.

If the problem still occurs, then please provide us your xls/xlsx file which you are converting to pdf.

We will check it soon and help you asap.