Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> da881b9a2e907b1c91aa551a51f14315ab9cc0f2c6d42c3bd6a4dc2248f97329:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^