Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bdce13b3bcb0ea92a8bd0e50609569bff4f3bb9c208d3f77d14e450a95d9d755:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^