Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> dd0adcd9c420ed1de6af264a42b6b2268a3549a6a1aec7a4455088bff8c0c535:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^