Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7f7965647f95a5180b477bd1a49a705cc95a7e0afae0e1d87a72064ec8d0a3d4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^