CODE_ERROR

There is an error in the cadence code of this transaction.

[Error Code: 1101] error caused by: 1 error occurred: * transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed: --> 2e24fa1794c3b7bff8517c03a03b69beb37c31d47d1a2b5f6c149f7590914dae:5:6 | 5 | FlunksGraduation.graduateFlunk(owner: signer, tokenID: tokenID) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: pre-condition failed: Flunk has already graduated --> 807c3d470888cc48.FlunksGraduation:21:6 | 21 | !FlunksGraduation.GraduatedFlunks.containsKey(tokenID): | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^