Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2aa221ed851e4e84efb25695b869ccac02db2c1174e9145942032ad547f2dc4d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^