Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 643fc5427f79a92dbc5d6b0cd41997a218e8915df2740b920aae4fbbd78293ed:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^