Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 55db51840c0c30cc0f54affb004c651e895ea10cabbf8f2e8bf0d3768b7f056d:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^