Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6b324bc73b6cb4f8884a23dc483e31a414cf3e8f18dc59f0b7a3e5ee332d2e69:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^