Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9bf387fd31a9a91905783bf8bbab73f8a534c1b319ca57cd9e71a6036baf1a36:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^