Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 64d0c28afcdef866a1d784b17d57777043431fb71149000059775c292730eeaf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^