Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ff327c2d6808eef173ca49bfb7e1b2ae0240c64708baea7af8ecd10623d3480b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^