Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4cb25da01ba5d46bffdf72d5c209fb8845b6757ebed46f2d9a57a2b72a02e6d8:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^