NullReferenceException is thrown while Word 2003 to WordML conversion

I downloaded the latest version of Aspose.Words for .NET, version 11.4.0, a few days ago and I am trying to covert a .doc (Word 2003) file to the .xml (Word 2003; WordML) equivalent.

I get an error when I get to this line of code:

Aspose.Words.Document wordDoc = new Document(filePath);

The error is a FileCorruptedException error with this trace:
Aspose.Words.FileCorruptedException was caught
Message=The document appears to be corrupted and cannot be loaded.

InnerException: System.NullReferenceException
Message=Object reference not set to an instance of an object.

I get the error for some documents and not for others. I have attached one of the problem files

Thank you for your help on this.

Hi Amuh,
Thanks for your inquiry. I have tested your document with latest version of Aspose.Words i.e. v11.5.0. and couldn’t reproduce the reported issue. Please download and try latest API, hopefully your issue will be resolved.
Please feel free to contact us for any further assistance.
Best Regards,