Emacs fails to open gnuplot files with extension .gp

Question

May I get some help understanding what it is that Emacs does not like about the extension .gp

Using emacs 24.5.2 on Mac OS X 10.13.6
I get the following error message when I try to open a file with extension .gp.

Debugger entered--Lisp error: (file-error "Cannot open load file" "no such file or directory" "gnuplot")
  gnuplot-mode()
  set-auto-mode-0(gnuplot-mode nil)
  set-auto-mode()
  normal-mode(t)
  after-find-file(nil t)
  find-file-noselect-1(#<buffer gpiofl.gp> "~/gpiofl.gp" nil nil "~/gpiofl.gp" (8739733818 16777220))
  find-file-noselect("/Users/cizmas/gpiofl.gp" nil nil nil)
  find-file("/Users/cizmas/gpiofl.gp")
  command-line-1(("gpiofl.gp"))
  command-line()

In this case, the file name is gpiofl.gp.  If I change the extension to .gnuplot, all is fine.

db48x · Accepted Answer

(file-error "Cannot open load file" "no such file or directory" "gnuplot") means that it was looking for gnuplot.el or gnuplot.elc, but couldn't find it. It was doing this because it was trying to call the function gnuplot-mode in order to activate Gnuplot mode. Are you sure that Gnuplot mode is actually installed? It sounds like you have associated it with files named *.gp in your init file, but have not actually installed the Gnuplot mode's code correctly.
To check whether the gnuplot-mode library is installed, you can say M-x locate-library RET gnuplot-mode RET.
See the github page for installation instructions.

Emacs fails to open gnuplot files with extension .gp

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