Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d1c19457743daf5fea5a186ec8465b2b4bbaaebb2c8bdfaefc64659212f78ced:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^