Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 243823afad75768d3ba2ca7bed10b5491f23d649a7ef0f124dc9e4f011dcde39:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^