Trivia2 Loop problem?

[milll929]

So I'm getting the constant error of there being it reading the loop too many times and I was wondering how to fix that, I'm currently working in school on the python learning book and on trivia 2 i'm starting to slip because of this problem.

#18_Trivia2

import sys

def open_file(file_name, mode):
   """Open a file"""
   try:
       the_file = open(file_name, mode)
   except IOError as e:
       print("Unable to open the file",file_name,"Ending program.\n", e)
       input("\n\nPress the enter key to exit")
       sys.exit()
   else:
       return the_file

def next_line(the_file):
   """Return next line fromthe trvia file, formatted"""
   line = the_file.readline()
   line = line.replace("/","\n")
   return line

def next_block(the_file):
   """Return the next block of data from the trivia file."""
   category = next_line(the_file)
   question = next_line(the_file)

   answers = []
   for i in range(4):
       answers.append(next_line(the_file))

   correct = next_line(the_file)
   if correct:
       correct = correct[0]

   explanation = next_line(the_file)

   points = next_line(the_file)

   return category, question, answers, correct, explanation, int(points)

def welcome(title):
   """Welcome the player and get his/her name"""
   print("\t\tWelcome to Trivia Challenge!\n")

def main():
   trivia_file = open_file("trivia.txt","r")
   title = next_line(trivia_file)
   welcome(title)
   score = 0

   #Get first block
   category, question, answers, correct, explanation, points = next_block(trivia_file)
   while category:
       #ask a question
       print(category)
       print(question)
       for i in range(4):
           print("\t", i + 1, "-", answers[i])


       #Get answer
       answer = input("What's your answer?: ")
       #Check answer
       if answer == correct:
           print("\nRight!",end = " ")
           score += points
       else:
           print("\nWrong.",end = " ")
       print(explanation)
       print("Score: ",score,"\n\n")

       #Get next block
       category, question, answers, correct, explanation, points = next_block(trivia_file)

   trivia_file.close()
   print("That was the last question!")
   print("You're final score is",score)

main()
input("Press the enter key to exit")

The error it has been showing me is:

Output:
Traceback (most recent call last):
 File "C:\Users\milll929\Downloads\Mills_17_Trivia.py", line 81, in <module>
   main()
 File "C:\Users\milll929\Downloads\Mills_17_Trivia.py", line 75, in main
   category, question, answers, correct, explanation, points = next_block(trivia_file)
 File "C:\Users\milll929\Downloads\Mills_17_Trivia.py", line 41, in next_block
   return category, question, answers, correct, explanation, int(points)
ValueError: invalid literal for int() with base 10: ''

Which my teacher has told me it is a problem with looping and it doing it too many times, can I please get some help?
Thank you!