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

[MadNuxx]

Hi, i have the error that when i want to start generating nfts, it wont do anything anymore because of the error in the title.
i already tried the suggestions from other maybe similar threads here but nothing would help. i added a few more layers than it was in the beginning, maybe its because of this?

I will post the rest of the error code for you to look at.

TypeError: Cannot read properties of undefined (reading 'forEach')
at C:\Users---\Desktop\NFT Multiplier\generative-art-opensource-3\index.js:122:20
at Array.forEach ()
at createDna (C:\Users---\Desktop\NFT Multiplier\generative-art-opensource-3\index.js:119:24)
at startCreating (C:\Users---\Desktop\NFT Multiplier\generative-art-opensource-3\index.js:148:18)
at Object. (C:\Users---\Desktop\NFT Multiplier\generative-art-opensource-3\index.js:180:1)

Thanks!