Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: unexpectedly found nil while forcing an Optional value
  --> fca49bd076c68172a5589ba7732879c0fb4d956a12101d67f5d8a4c7ef9b7889:15:57
   |
15 |           .borrow<&{NonFungibleToken.CollectionPublic}>()!
   |                                                          ^