Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1448360ba2f54b37b2fd38a8e28655dece2d0661946ae44bb3f74414fdbbd21c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^