PostScript Error [ %%[ Error: undefined; OffendingCommand: M_Core ]%% ] - ( 0x01004002 )

Did you sort this? im suddenly having the same issue

Without any info about your artwork, your print settings and so on nobody can tell you much beyond stating the obvious: Some PS command is either not being generated correctly by the printer driver or not processed by the printer's RIP. You need to be more specific and provide much more info.

Mylenium