Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 275f529c0194e24fc4126bd6bc40b0d589bf2bc8e6a3e6fcd32a3399241e95a9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^