Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 476848be9391b0b5643659b76be0522a2bb4dbfffcc22f8bf4323ff7a8ab1baa:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^