Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8d1fee90ea8494b28a3deeeccf1d98881d4f326d7c0d13ceb94cf8c7f2da0807:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^