W2_A2_Ex-8_length error, costs length 20! = 1

[Mubarak_Ibrahim]

I wrote the code, but during the test it says length error, costs length 20! = 1
here is the output

[paulinpaloalto]

Most likely that means you hard-coded the number of iterations on the call to optimize from model, instead of respecting the parameter that was actually passed.