Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0380211d001c6a07e5a4434e4f09d38b651dc3fbcc551c62796b8ce8bc68a591:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^