Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 12cbc4e7bd15782cccd24b4f23fc49b95656f6c4ecbb93685c86ad30050249da:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^