Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 30a73948c67d0abe2ffff9b000da7f323e68c44d97d21885a3cd35e429ceaf46:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^