Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 50c60baa79e5944509c1334c3031b043fbd04eeee333d81b2d6b48a8899b3ee4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^