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Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today. # Key Error - what does this mean

I was doing some practice on lesson on 'raising' errors and exceptions, but I noticed a new error called "key error" appearing

```import math

def split_check (amount, people):
if attendees <= 1 :
raise ValueError("more that one person needed to split check")
return math.ceil(amount/people)

try:
value = float(input("how much? "))
attendees= int(input("how many? "))
amount_due = split_check (value, attendees)

except ValueError as err:
print ("oops, that wasnt expected")
print ("({ })".format(err))

else:
print ("the cost per person is" , amount_due)
```
```import math

def split_check (amount, people):
if attendees <= 1 :
raise ValueError("more that one person needed to split check")
return math.ceil(amount/people)

try:
value = float(input("how much? "))
attendees= int(input("how many? "))
amount_due = split_check (value, attendees)

except ValueError as err:
print ("oops, that wasnt expected")
print ("({ })".format(err))                         <------------------this line here

else:
print ("the cost per person is" , amount_due)
```

any help? Hi Sabry, its very difficult to debug your code in the way it is formatted. If you could either share your workspace or copy and paste the code in here in code formatting we may be able to help. You can do code formatting by typing three backticks (```) before and after your code.