Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 05b90cf8e4c10d3a5984832936b9603f29c07d6f42d0fa6c5e0faca3cbc3dd27:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^