Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b115af6652da4e210cb84d190f86d955f5b6dcc7bf22f65ee92e5dd66fc58c11:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^