Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7fdfc63ae08bdcb701818f98f11776c540edb60d04c1baaf0eeca8fe0a78ffda:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^