Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction invocation failed when executing transaction: [Error Code: 1101] cadence runtime error: Execution failed:
error: unexpectedly found nil while forcing an Optional value
  --> 98f01d03544a7a451d7586243cc18f70a38d63ae71a8456218a5ce6228ed5d81:23:19
   |
23 |     let vaultRef = signer.borrow<&FungibleToken.Vault>(from: StoragePath(identifier: "USDCVault")!)!
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^