Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1fe6eba72a49e5bd0da276c7cad1ae2c96d5873a7382228c098f484a71c64516:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^