Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 34b0110a0c4031963fe7cc3c8d61b61a59df6a4cd17fe0cb77df7165abeddaf4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^