Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7f1c65eb2ca9df4b53c9954499a98c9964598b35222adad4769b92dafe0b97b7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^