Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7b21be4430839b08b777624411d81373af2d57a2caea3623ef229211ddc67871:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^