TypeError: Cannot read properties of undefined (reading 'includes')

[ghost]

The code works perfectly fine if I use chainId == 31337 in both the lottery deploy script as well as in the mock deploy script

if (/*chainId == 31337*/ developmentChains.includes(network.name))

but whenever i use developmentChains.includes(network.name) I get this error

Error: ERROR processing /home/amey/hardhat/hardhat-smartcontract-lottery/deploy/00-deploy-mocks.js:
TypeError: Cannot read properties of undefined (reading 'includes')

helper-hardhat.config

const developementChains = ["hardhat", "localhost"]

[krakxn]

const developementChains = ["hardhat", "localhost"]

Typo above, can be fixed by: it should be developmentChains instead.

Hope this helps!

[ghost]

ohhh, once again thank you so much!!

[krakxn]

All good!!