Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 32be9c93ef4812741acd120ebaf4044e872f6e28e3f3fbd27e97124361fcb3fa:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^