Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
   --> 0b9004248baa9d9dfe714ba6e4168fab98f857b2071c6c2eed3e1b5c54e3d1e0:203:19
    |
203 |         self.nft <-collectionRef.withdraw(withdrawID: nftId)
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: panic: missing NFT
   --> c6945445cdbefec9.PackNFT:711:67
    |
711 |             let token <- self.ownedNFTs.remove(key: withdrawID) ?? panic("missing NFT")
    |                                                                    ^^^^^^^^^^^^^^^^^^^^