Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2d6c2deb09da7a6ef113e0f7a4e19c2e09f5b35a8c16c3a0d8588c8d3715a9f5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^