Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1a47fde307ea851ac576a824030646bff5b9bc491f47cadca6b0d2cf1ce21c8c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^