Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 00e9f5b8411b007cd9fd9dc465f3b3d08652c38130856e0401ca1f3f71bcb419:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^