Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9fde73b0104780268bbcae6e6db1630e75fd72f336b7c4c94f14f37d9aa5b806:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^