Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 10bfafd7c8b12bc039d55e7ac872acf459b982ffcdb526dfe7d3a18c77e6ae4c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^