Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7d24a7a9091fe561c809b2c7d9125f56c1744b1300f0524962f4177fe7cd9e6d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^