Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c036e3824c7520f31a462d7a848675964629ec4684e4cdb0576ee7f3a37de8f0:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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