Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3449a725189e5ec610f03716bb5de6957d158456eb1bab7de63eac4667b941da:12:46
   |
12 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: unexpectedly found nil while forcing an Optional value
  --> 8f3e345219de6fed.NFL:69:63
   |
69 |             let token <- self.ownedNFTs.remove(key: withdrawID)!
   |                                                                ^