Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e5f740bbaf22894b4c9f759e4f57ed0d8eadaff36b9ac3489962c8ec5cb79b4d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^