Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
error: underflow
  --> 59ebbe2f1b2fa74b63f9abc43503173ce8a09cc570702ed2c125806898971ab4:27:51
   |
27 |         let sentVault <- vaultRef.withdraw(amount: signer.availableBalance - 0.0005)
   |                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^