Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
 --> 8d05104b92613746cb39cd975b91bb96052e264198f0b3f1c19b082d36d5d62e:5:6
  |
5 |       FlunksGraduation.graduateFlunk(owner: signer, tokenID: tokenID)
  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: unexpectedly found nil while forcing an Optional value
  --> 807c3d470888cc48.FlunksGraduation:25:21
   |
25 |     let collection = getAccount(owner.address).getCapability<&Flunks.Collection{Flunks.FlunksCollectionPublic}>(Flunks.CollectionPublicPath).borrow()!
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^