Error when remapping code is running?

I installed Linuxcnｃ through the rip method, and an error was reported when the remapping code was executed: the interpreter could not be found, how to solve this problem?The ubuntu I use is upgraded from version 16.04 to version 18.04, linuxcnc installed by compiling and installing．How do I find this interpreter or how to make it run?Thanks in advance, my code is as follows:
 

import linuxcnc
from interpreter import *
import emccanon
from util import lineno