Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d78ae68dcb329c2bf52375d686c7bb09064c3441a61c5faf26f54a8430cc6bb1:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^