Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 813dd9acc6972e1b3a8d0308cab4a332595b9d5a55ae56b3a6adb1b01b3a9278:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^