Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4b07d00afdafacc34f109761f3edbeadefafd4d6be419f168cf2dd4facb3629c:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^