Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9e46b332cbfb64766898052e0abdd66abfeb919e7c9775e4ccc798018bcaf7cc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^