Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 601fd300692e3bb0f1081517f5386475ad5d60ec22c33b67f7a457702496508b:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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