Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 272d37b71a662c4c493aba68d0ac6906a8c7885f3a5b5aa476da0feb5f5ae784:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^