Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ad0daf07b90fcb1f1e59c36efb39cf42466e40a65a3bb8121b9e5c8747e3616d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^