python exception windows error 2 : the system can not find the file specified

i am trying to run my first mapreduce program on amazon aws. i tested the code running locally, there is no problem with the code. however, whenever i tried to run on aws, it just results above error. my program code:

    # -*- coding: utf-8 -*-
    ## python mr_statistics.py inputFile.txt > output.txt

    from mrjob.job import MRJob 
    from math import sqrt



    class mrMeanStd(MRJob):

  def mapper(self, key, line): 
    num = float(line)
    var = [num,num*num] 
    yield 1,var


def reducer(self, n, vars): 
    N = 0.0
    sumv = 0.0
    sumsq = 0.0

    for x in vars:            
        N += 1
        sumv += x[0]
        sumsq += x[1]

    mean = sumv/N
    sd = sqrt(sumsq/N - mean*mean) 
    results = [mean,sd]
    yield results


    if __name__ == '__main__': 
        mrMeanStd.run()

Here is my console output error log:

Console error log:

Any help, thank you!!!