Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 885a7ed69e5e21ac9793f5094face9e57476ee12578ebadf4c8f043d1e510c9a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^