Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0f0b746d5e78bd135aaa974a51f7a409713e2e330f9be0966c1d7a292d5af0ba:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^