Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d5cf7db6e766698f54ac44c4d7320175991498a7e98226ec869c7e0b17857750:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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