Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5b933d14fd8d3a5a74b449ce92de6d93ce0017e92163eba63eb3dab4d0963391:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^