coq related error when exporting to latex.

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i get the following error when i try to export to latex:

org-babel-coq-initiate-session: ‘run-coq’ not defined, load coq-inferior.el

i've searched for the error on the internet, found out that the file 
"coq-inferior.el" exists:

https://github.com/maximedenes/native-coq/blob/master/tools/coq-inferior.el

i've downloaded the file and tried to manually load it, got:

eval-buffer: Cannot open load file: No such file or directory, coq

turned out i had to move my cursor to one of the coq source blocks. even 
then, in first try, i got:

let: Symbol’s function definition is void: coq-mode-variables

and in second try, it successfully exports. this process above is 
consistent. it exactly follows those steps everytime.

i've thought of adding some hooks but then found the idea very messy. 
besides, my elisp skills fail me in that case. i can export, in the end 
but, how can i resolve this neatly?