Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6f80ec6bbcba1eaddf52f19ff721c6c7561664f8abe94df7cd626538b4deccbd:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^