Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> eb3ab2b8518521e71d41dea25e62039c9531857626f25337596559059e9a07d5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^