Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6cb1330ce8054032e992c818c6f09f0476f26294f4129ddd6fa4545d21506cb9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^