Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c383f2ee768a26cf270c57c5acacc0f042f9514b43d0926c42dad0d04e625129:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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