Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 39f25e399cf24d6de4660e0562c82719f59e48c5afbdb1ef8a9d7a8397b19f94:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^