Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6cc31e43f40e07e5d20c17a1ec3858b74514ae68417e2b3d6b5ac7a3181f6961:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^