Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a52d5cbe011868c487b362e5ffdd49dd07acfb5d9c7a426cf98404f70c786e5e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^