Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4b1f2de6814998a4ed022f990bcfcd9587502fbac8eb6335c8eca6750bd7582b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^