Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bfbc6421899732e82dbacda3dbae5f8936bfc369da48a6a43f9f8fb4b23a25c7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^