Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6046b3aee3bd1e02d8baaa81892e5149c47ad515e94b2baa840d9755fd4c10ca:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^