Hello,
if we try to load the attached PDF into a Aspose Document, we get the error “Cross reference table or cross reference stream not found”. Also in your Online Demo.
Please check and fix it 
202203140814120065OriginalRechnung.pdf (370.0 KB)
Kind Regards,
Andy
We have tested the scenario using the latest version of Aspose.PDF for .NET 22.3 and have not found the shared issue. So, please use Aspose.PDF for .NET 22.3.
Hi Tahir,
i tested it on your website: https://products.aspose.app/pdf/conversion, i think the lates version will be used there 
With this Result (error at the bottom):
Kind regards,
Andy
dfX3_fdc7b91e-6c57-4128-92c2-5b9fbad02274.png (1.42 KB)
QR8c341bc8-75b7-4e2c-99c3-2d2ba4031ede.png (458 Bytes)
We have managed to reproduce the same issue at our side. For the sake of correction, we have logged this problem in our issue tracking system as PDFNET-51546. You will be notified via this forum thread once this issue is resolved.
We apologize for your inconvenience.
Hello,
This ticket has been in existence since March, we pay a lot of money for the license and it is not ok that errors that are obviously in your possession last more than 4 months.
Kind regards,
Andy
We try our best to deal with every customer request in a timely fashion, we unfortunately cannot guarantee a delivery date to every customer issue. We work on issues on a first come, first served basis. We feel this is the fairest and most appropriate way to satisfy the needs of the majority of our customers.
Currently, your issue is pending for analysis and is in the queue. Once we complete the analysis of your issue, we will then be able to provide you an estimate.
Hello!
We are experiencing a simmilar issue, but found this old thread first, so I would just like to reference it here Openning a PDF document fails: Cross reference table or cross refference stream not found - Free Support Forum - aspose.com. The documents and code are also there.
Kind regards,
Aleksander