Obviously it must be a space between Java class name and the document path:
Dxl2Pdf E:Websites_tmpbpl1454/html
instead of

(as I just noticed – you resolved the problem)

Well, Dxl2Pdf is a Java class, designated to convert Lotus Notes documents in XML form (DXL) to PDF. Is it your intention? “html” at the end of the command line makes me suspect it is not.

If you need to convert HTML to PDF, take a look to the info: