Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> 4dc2355f0ec0c3001dcb259fd0feb8670b16cb2a363c061712782369227bb8c5:17:8
   |
17 |         tryBI(tokenInVault: flowTokenVault)
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: underflow
  --> 4dc2355f0ec0c3001dcb259fd0feb8670b16cb2a363c061712782369227bb8c5:29:24
   |
29 |     let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^