Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 831ae4198a8bdfecb86059178e6f7e3879ef1a1bf0a437731289241fe201459a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^