Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 827d1501a99135d0e7a1281e2d47eb3879aa96bb71a595066e425ebb51474a39:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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