Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3077f6a42fa1c891e169345b767da4dcb1f6e6851e06dad882550a2eb33a7c3b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^