Adobe e-signature won't save.

I am sending out documents for signing, through xero tax and receiving the signed copy back.  I can open the signed copy in pfd, but when I try and save it, I get a message, do I want to save a blank copy? so I try and print it instead, to cute pdf or microsoft xps document writer, and it saves blank with this really weird error message.

ERROR: undefined

OFFENDING COMMAND: eexec

STACK:

/quit

-dictionar

How do I save these files?