Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8bbf9da9d7ed9748783d89055ee5fcc1be646dc1e21dc73ca83cac40c1f2a0e0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^