attempt to call global 'import_all' (a nil value))

I am trying to call the lua script deskew.lua from C++ program

function deskew(imageinp,imageop)
print("Entered Lua Script")
import_all(ocr)
proc = ocr:make_DeskewPageByRAST()
input = bytearray:new()
output =bytearray:new()
iulib.read_image_gray(input,"/home/ima/Desktop/OCR/ocropus-0.3/ocroscript/tilt.png")
proc:cleanup(output,input)
iulib.write_image_gray("/home/ima/Desktop/OCR/ocropus-0.3/ocroscript/scripts/deTilt.png",output) 
print("Exit:Lua")
end
gives error msg " attempt to call global 'import_all' (a nil value)) "

C++
/* initialize Lua */
	L = lua_open();

	
	/* load Lua base libraries */
	luaL_openlibs(L);


	/* load the script */
	luaL_dofile(L,
"/home/ima/Desktop/OCR/ocropus-0.3/ocroscript/scripts/deskew.lua");




whereas other lua script in same directory having the same import_all(ocr)
runs fine .:-(Can any one suggest me some solution for this problem..Thank
you

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