Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 10ac705d0585c7bf345b9edcca1bcb00d868f36d901dd21666d567fdbc3ddb64:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^