Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a4ff4706d95d9e4c718fe8254494d3e79790240adfca60d84d3838def85c822f:13:46
   |
13 |                         self.transferToken <- collectionRef.withdraw(withdrawID: tokenID)
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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