When you have an error code:
MIL led will turn on
MIL in the datalogging data(parameters) window will turn ON(RED) (double clicking will open the error code window)

To view error codes:
Click "Error codes" on the view toolbar

Click "View Error Codes" after right-click on the datalog grid

Click "View" -> "Error codes"
Shortcut: CTRL + E

Clear Error Codes:
Click "Clear DTC(error codes)" after right-clicking on the datalog grid
Click "Clear DTC(error codes)" after right-clicking on the error code list
Click "Tools"->"Clear DTC(error codes)