Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9fd9a79e26f0e2ce5c7d380dab8e52fafe9aed43fa7924472b469afa71dabfbf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^