Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 78cf75f2c86246c7bda10fc3db877130b80a6a49ae94af957082fb9020c0e18d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^