Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e986c003c41513d7716c4992a45ae094096a0122bf6f0f7cc5097bfefcd91e16:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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