Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5b03b562b5dabe9b9aa4ae1e807677fded19b6ed585a3f7f0719ba65e435b91f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^