Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ceb060b61df25dbb5f34d4e824e0930581765439a9f88fec10a0f7fb3b5f32b3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^