Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5e94f09c7c4c0d8027f8a68390ddbaffa2c85138b9be4ec940c7014fd8202a2c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^