Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6f9e3bc552fe9c68cc27a4cf3cbc45f5d3f4fec6195e762f4b047cc68c7ddfdf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^