Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 556b451fafa029a7ed981855016247fe505c064a1be0473067b203f80bb1b630:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^