Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e5ebed968fe72a94546c3a99f47e1272ec29ababa72dc0af950866406fb07d27:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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