Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bd871024cde8aa8c352c5f6aa12f64dc494e6d44ee62fa665b2c173d956dd291:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^