Error code 9 occurs if a printer with the same name already exists on the system.
Error Code -9: The specified Printer Driver does not support the current Operating System.
Error Code -10: The specified Printer already exists.
Error Code -11: The specified Printer Driver already exists.
Error Code -12: The specified Port already exists.
Error Code -13: The specified Port Monitor already exists.
Error Code -14: The specified Port Processor already exists.
Error Code -20: The driver’s name is not specified in the INF file
Error Code -21: The configuration INI file name is not specified in the INF file
Error Code 151 & Error Code 161 - Certificate