Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 20326d95b262c862159b5f5c636d0e39672d13bd06d7c10c87b05441179ba347:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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