Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2ed53b0c685778a9cb5f81c098098f35b64c86fb589c26df9e4022fe9eb98f35:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^