Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 26e423df1b1176c9a83cb73ed1f2f3f6bff50eddcb235d9a86d6713eacb2e71c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^