Help me!! I can´t convert PDF to Excel and not accept MemoryStream

How i want convert PDF to Excel, if i generatethe document, but, how i opener the .XLS, i send me a error



Too, when trying generate the document PDFDocumento (Aspose), i send one MemoryStream, but, send me a error

But, if i save the MemoryStream if it does...



Thank you very much, for yours comments.

Ragards.