Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8ff785ddf6d80608b4d211c66400361fb7c9d16f7b0e35c61c2c2649cdc008c0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^