Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1a2dc7a6dd01e968fe6f41fb871915f85658734c70f5819e837caf040157cf78:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^