Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f2301fd3f36f417066e3d0f6ac1c7fd9895d285d0f5fe1d3c8abbd59f60459c9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^