Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3d2a1c68bec159940f51aae4cb4105c4208588ee79cc4a4b6736ddbce0a3b5ea:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^