Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 19b0f74e9041791431f91d61c8e853cc0f0abdf6d661b59f304eb5dcb6dcb4a8:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^