Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4ca437c5fa71bdd9e66f8badbcaf7ff6f75b1fc441109d680f3f8cb8544e9604:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^