/undefinedfilename error

[tschaume]

FYI: When starting with a new plot and running make_plot for the first time, the following error tends to be thrown. Rerunning fixes it, though.

Error: /undefinedfilename in (SingleCharacNew.eps)
Operand stack:

Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push
Dictionary stack:
   --dict:1176/1684(ro)(G)--   --dict:0/20(G)--   --dict:77/200(L)--
Current allocation mode is local
Last OS error: Invalid argument
GPL Ghostscript 9.10: Unrecoverable error, exit code 1