Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1b973eb4b2dac8f6d6582cf2c2340534ce746dbf6ceb49d803d987dd8e6f1f89:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^