Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ba98e121be531ebcb62f8d0fb0c2791dea6d8a9f28555a0faa68dac57ebc6d2b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^