I am running into a NullReferenceException using Aspose.PDF 19.4 in my own application and narrowed it down to the Save method on a Document. To make sure it wasn't my code causing the issue, I tried running the hello world example in this repo but tweaked to save to a stream to match how my app was working, and got the below error. Any ideas how to fix this?
System.NullReferenceException: Object reference not set to an instance of an object
at #=zrfrUImb7jZrPxl6ucZ5zNV9DARLP.#=zrIGtZ6o= (#=z7yZ2j1uLuKOW3Mjv7iBPtwH3Y3ZT #=zvgUMzhxilvJ$) [0x00014] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=zf5Xplt8SxpLmjY2gnjKga9k=.#=zCHp0IXk= (#=z7yZ2j1uLuKOW3Mjv7iBPtwH3Y3ZT #=zvgUMzhxilvJ$) [0x00035] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0003b] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:305
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zs919QWqrlYGtp0d8HnE2iVs= (System.Object #=znOmGh_c=) [0x00000] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zbuTtbUQf9v4z9CLlfpkWc5NONpP1NH61Xg== (System.Object #=znOmGh_c=) [0x00025] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zD1z8jhB_bImTFA1KQH_CXh8= (System.Reflection.MethodBase #=znOmGh_c=, System.Boolean #=zKJQ1vAs=) [0x0020c] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zr1qAW2dJZU56Fifz$DRtrJQ= (#=qA0cVKYayviYAiKvxD3jKmFCvKBcZO1cuNkLywGPCX4s= #=znOmGh_c=) [0x00029] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zjQ2kpb7QJHXuCFyqDIfbc6bxeif3Guj2t5kRHFY= () [0x0006f] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zoZhjcbxKCu1OlfqNiZQyhtBOhMag () [0x00005] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zs919QWqrlYGtp0d8HnE2iVs= (System.Object #=znOmGh_c=) [0x00000] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zbuTtbUQf9v4z9CLlfpkWc5NONpP1NH61Xg== (System.Object #=znOmGh_c=) [0x00025] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zeDxoLlmnn6sLuiwJZ3kySdEqr9Qm () [0x00021] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zQuJefDFFUH6arI2RL7Xny4w= (#=qA0cVKYayviYAiKvxD3jKmFCvKBcZO1cuNkLywGPCX4s= #=znOmGh_c=) [0x00005] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zjQ2kpb7QJHXuCFyqDIfbc6bxeif3Guj2t5kRHFY= () [0x0006f] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zoZhjcbxKCu1OlfqNiZQyhtBOhMag () [0x00005] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zs919QWqrlYGtp0d8HnE2iVs= (System.Object #=znOmGh_c=) [0x00000] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zbuTtbUQf9v4z9CLlfpkWc5NONpP1NH61Xg== (System.Object #=znOmGh_c=) [0x00025] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zeDxoLlmnn6sLuiwJZ3kySdEqr9Qm () [0x00021] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zyEPA4nnEbHwoj0a0kw== (System.Object #=znOmGh_c=, System.UInt32 #=zKJQ1vAs=) [0x0016f] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zoZhjcbxKCu1OlfqNiZQyhtBOhMag () [0x0001e] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zXiHq1JqAXT1nVsgy7_u_4Co= () [0x00066] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=z5$W8JnZoxMUxFZCZ9nBeVsRX25Eiv12nKg== () [0x00005] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zs919QWqrlYGtp0d8HnE2iVs= (System.Object #=znOmGh_c=) [0x00000] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zbuTtbUQf9v4z9CLlfpkWc5NONpP1NH61Xg== (System.Object #=znOmGh_c=) [0x00025] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zeDxoLlmnn6sLuiwJZ3kySdEqr9Qm () [0x00021] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zyEPA4nnEbHwoj0a0kw== (System.Object #=znOmGh_c=, System.UInt32 #=zKJQ1vAs=) [0x0016f] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=z5$W8JnZoxMUxFZCZ9nBeVsRX25Eiv12nKg== () [0x00024] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zQ5pdWvrfMJWQpyweT_AkOQA= (System.Object[] #=znOmGh_c=, System.Type[] #=zKJQ1vAs=, System.Type[] #=zLQM$Grw=, System.Object[] #=zkxlc94Q=) [0x000b0] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zmDDIFHbuPCYW5n5B6w== (System.IO.Stream #=znOmGh_c=, System.String #=zKJQ1vAs=, System.Object[] #=zLQM$Grw=, System.Type[] #=zkxlc94Q=, System.Type[] #=zx3KnP8k=, System.Object[] #=zmd0rShU=) [0x00010] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zvzW4XjAI4ieAQmFs5zIGtvMzO0v6ctZBpel8OF4= (System.IO.Stream #=znOmGh_c=, System.String #=zKJQ1vAs=, System.Object[] #=zLQM$Grw=) [0x00000] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at #=qBVcPFVNsk1VCnIglM9dyb854eZvi1sYdOocJizgIlOs=.#=zTrgnC51gLkD5hJWbJTysEN5HzUSZa6TI3j8OR_8= (System.IO.Stream #=znOmGh_c=, System.String #=zKJQ1vAs=, System.Object[] #=zLQM$Grw=) [0x00000] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at Aspose.Pdf.Document.#=zaQMY1WxSvSde (System.IO.Stream #=z_scZQvM=, Aspose.Pdf.SaveOptions #=zVOKmEcCtwEbL) [0x00141] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at Aspose.Pdf.Document.Save (System.IO.Stream output) [0x00009] in <6cf8ce1e23124d98df6de66c2a643c37>:0
at Aspose.Pdf.Examples.CSharp.AsposePDF.QuickStart.HelloWorld.Run () [0x00036] in /Aspose.PDF-for-.NET/Examples/CSharp/AsposePDF/QuickStart/HelloWorld.cs:26
at Aspose.Pdf.Examples.CSharp.RunExamples.Main () [0x00017] in /GitHub/Aspose.PDF-for-.NET/Examples/CSharp/RunExamples.cs:69