Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ddff7c95cbfe50a5c4a72a775031071401c0baee2ce1e0cc3e821bfffb5f52b2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^