If you have changed computer, you might have to copy files across. Berate the author of the PostScript for not telling you. Some PostScript interpreters do not allow file access, for security reasons. And many printers do not implement file access at all. Some require an optional hard disk to be installed.
Different interpreters have different conventions for accessing named files.
Unlikely to occur, unless sending a file to the wrong device, or a badly configured one. Less obviously, if a program scales everything down to a point this error will occur. VMerror Printer out of memory. Use a lower resolution, if available. Use a smaller page size, if applicable.