Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> 11fee99d8432c98ff05543849c7e04c981f89c5a8ff3e56c2697369c5e3799c0:17:8
   |
17 |         tryBI(tokenInVault: flowTokenVault)
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: underflow
  --> 11fee99d8432c98ff05543849c7e04c981f89c5a8ff3e56c2697369c5e3799c0:29:24
   |
29 |     let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^