Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 80c8aeaa952f0e9bd3b6a9a388a95320583a904450d1cd614d4a205e2f44a66c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^