Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8ce91fb959c5d78a645cc85610dcf386d76460ca63eb63251db4b35f71fc00b8:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^