Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1c094d105a79b63ab06bb2b30b73c3e56b826e7329c2a633a6a9214b4fbc565b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^