Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f2ba3e80d8e420f6ee1e894f14b71dc3b30f1f31a02e50a515607b68436e03e2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^