Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 701560d6f286fa1104e3198c9b63dd0c6db31c602ab06e17522562cd6a296216:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: unexpectedly found nil while forcing an Optional value
   --> 1e3c78c6d580273b.LNVCT:218:63