Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f86a113a6099f381f98b90cc71bd41d7d2945f988c8376c67d34f84987d9f36c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^