Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a3d061a1d9b7a8c3eff14e9df10c93ae2ebd2f34dd27d875062d43eb697c53dd:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^