Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 237b1d4053a299a8d81e647748692ac438e42e8e113db51068b26baa94caba80:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^