Help With Error Mseg

Please help so I can go home some time tonite.
I am printing a 28" x 54 "on a Roland SP-300.
The print comes out with 2" verticle lines across with "Not Registered" in the corners. The width of printing space is 28.1. If a print is slightly larger I normally get a warning along with the option to "print anyway" mesg. This did not happen. My computer has been wacking out all day so I am not sure if its a file problem or a prinable area issue. I have not seen this before. I can not open the file anymoe in Flexi or Corel ~ comes up as an error wether I open or import the .eps file. Any thoughts?
Thanks, Lynn