Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6d66af4b505200f590fd975c52940285334fc086e590236f08ceb97708c768e7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^