Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> afe86c237c2c93b01f0b3f72672631feb1b4bc5a963bb3392f6c1e6ea845f8ae:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^