The simple solution to this error is that you do not have a “default” printer.  Most of us have just one printer.  When I looked at mine on the PC where this error was occuring I noticed that the printer configuration did not have a check mark in the default box.  I tried to “check” the box but it would not “hold”.  The solution on this PC was to delete this printer and add  it back in and this time check the box for “default” printer.  Doing this eliminated the E365/postscript error.