Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> be2ccd8c935904ae47652990a63f6b5fb1d58fd6d8bd0787fd05dc11f971f9b8:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^