Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9e286e843159449ab7c4508680295a6d5f56895d61a3f0cde4ca8a7f9ff7ca6a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^