variable is not defined

[hentera]

It keeps telling me variable "number" is not defined, where am I going wrong? I'm trying to get my program to convert a number to a roman numeral. My I need the main function to use the information from the toRoman function. 

import sys

def toRoman(number):
    if number == 1:
        print (I)
    elif number == 2:
        print(II)
    elif number == 3:
        print(III)
    elif number == 4:
        print(IV)
    elif number == 5:
        print(V)
    elif number == 6:
        print(VI)
    elif number == 7:
        print(VII)
    elif number == 8:
        print(VIII)
    elif number == 9:
        print(IX)
    elif number == 10:
        print(X)
    return number

def main():
    try:
        number = int(input("Enter a Number: "))
    except:
        print("Sorry, please enter a number between 0-10")
        sys.exit()
 
print("Results: ", toRoman(number))

main()