Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5a101ab8c9dc085cb7b24c493adac1067dc0c9d1795061c287408e0365aeeebd:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^