Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d60ced1db4f1b4c5c4a5e7bea55432b2f88ccb47d0604e8ccac84dee8831e939:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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