Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c50bed6eeeff0d8194fed8d31c980e1a837c32ce3715e18e76c6e0f4ed99b0c4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^