Converting PNG -> PDF on Windows Server

Hi.
We're using Aspose Total for Java to convert PNG  images to PDF's.
When we run this operation on Windows 7 (64 bit), everything is OK.
When we run the same program on Windows 2012 server, PDF is broken.

PNG and broken PDF in attachments.

We use the code from this example:

http://www.aspose.com/docs/display/pdfnet/How+to+Convert+a+text+file+to+PDF

I hope, You can help me.