Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c4ff20fc05103b8c4929425693f3d258beb5881b370b523392d8319f62c46573:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^