Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a3eabf114428ff1d33a3d8adc0750a7eb5fe7c7c63bed04d6d1da5383a4cfd93:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^