All of the LNC functions return an error code; zero means no error. These are the error code values which may be returned:

Value and Macro	Reason
1 = LNCE_NODE_NFND	node not found
2 = LNCE_SECTION_NFND	section not found
3 = LNCE_PAR_NFND	parameter not found
4 = LNCE_PARSIZE	the size of the output buffer is not big enough. The size is set to the required value.
5 = LNCE_PARTYPE	the parameter cannot be set to this type
6 = LNCE_BADVAL	the value to be set for the parameter is invalid
7 = LNCE_EXIST	the element already exists
8 = LNCE_RESTARTNOT	on calling DoRestart, the user selected No on the restart Windows dialog
9 = LNCE_NOACCESS	the client does not have administrator rights
10 = LNCE_READERR	reading a value failed
11 = LCNE_WRITEERR	writing a value failed
12 = LCNE_NOMORE	an enumeration function has reached the end
13 = LNCE_NOSET	the parameter cannot be set
14 = LNCE_DEDIZERO	there are no nodes in dedicated mode
15 = LNCE_DEDITOOMANY	there are too many nodes in dedicated mode
16 = LNCE_SHAREDZERO	there is no node in shared mode
17 = LNCE_SHAREDTOOMANY	there are too many nodes in shared mode
18 = LNCE_DEDIHOLE	there is a hole in the core use in dedicated mode
19 = LNCE_PROP_NFND	property number is invalid
20 = LNCE_NODEDEVS	node cannot be deleted as it owns devices
21 = LNCE_MEMTOOMUCH	total memory too much
22 = LNCE_NODEL	the parameter or property cannot be deleted
23 = LNCE_NUMPROC	the bootparameter NUMPROC is greater than or equal to the number of available cores
24 = LNCE_VPORTTOOMANY	there are more than 4 virtual serial ports
25 = LNCE_VPORTINUSE	the virtual serial port is already in use
26 = LNCE_NODERUNNING	the requested change cannot be made while the node is running