Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9759d7ef6967cefb01571c61680131f183c565ca57ef4349d8d37f50ffc5b15d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^