Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 88a30bbc820167e70d3356913e3ca3d96b0dd02fc13c50819fc0be1bfba8f2ca:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^