Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 88316f92b1f75bf51f70451e7310fa9054ad32d5a9b6b0f74a30c28f1b06ef6a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^