Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e1ccc9dfc4e863af2b1204b05f3e46da64e3e4ac29e561ccd58382659abdb605:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^