Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f13defe9ac9b54cfe4574841eae8c282816d2cecaa1b84aedc9bf975a5ec37d6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^