Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fbfdc3980a7cd618603d09bd8e986a47a845a3c6e71ae493eabf94274d05dc08:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^