Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d1e9897dfd144261aec50ad7bafce6f6a0dee0fd3a3189e0b5094924d3ed8df6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^