Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fa3c552eab850b5977dd8664c0b8faf5b404e42c06cb75dc6e5bbc3cb9e662ce:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^