Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1490401772b24e137069047e40e0f1c97c416b85184f51d053fa73c417d35db6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^