Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c710b384c59c78b46d26ceba9bc643dc2193bbbaeee25fb0e380791cef9c55ed:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^