Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3317eac7ac148f470adfffa16ddf2b0bb2ea8cd83fb4e8744fba2c707c4eaa5c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^