Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 82b3165b471a0a9de5c5c7c07ad4b70cd736f286ba87e885e70d3a39b5ec35c1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^