# Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 46

### Tell us what’s happening:

Hi, I get the following message "
Your code raised an error before any tests could run. Please fix it and try again."
I have been stuck for hours and can’t find what’s wrong.

``````NUMBER_OF_DISKS = 4
rods = {
'A': list(range(NUMBER_OF_DISKS, 0, -1)),
'B': [],
'C': []
}

# User Editable Region

def move(n, source, auxiliary, target):
if n > 0:
#move n - 1 disks from source to auxiliary, so they are out of the way
move(n - 1, source, auxiliary, target)

rods[target].append(rods[source].pop())

#display starting configuration
print(rods, '\n')

# User Editable Region

# initiate call from source A to target C with auxiliary B
move(NUMBER_OF_DISKS, 'A', 'B', 'C')
``````

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0`

### Challenge Information:

Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 46