Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bec6d7a468193474e04f2c01b4f6ff2d3007cd3aa1717982cb0a85f9604b3f2d:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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