Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: unexpectedly found nil while forcing an Optional value
  --> 6d6145b75981d9e5926798d237a3584e2995caab7cff1a7c9d19f57b16179ca3:14:63
   |
14 |                 .borrow<&{NonFungibleToken.CollectionPublic}>()!
   |                                                                ^