OPC Classic Client Error Codes

Error code (Decimal)	Error code (Hex)	Meaning
00	0x0	No Error
01	0x1	Failed to load OPC Automation DLL
02	0x2	Connection request to OPC Server failed
03	0x3	OPCGroups Object not retrieved
04	0x4	Failed to add I/O Group to OPC Server
05	0x5	OPC Server Status is Unavailable
06	0x6	OPC Server is not in Running State
07	0x7	OPC Thread heartbeat fail
08	0x8	Unknown Error
20	0x14	The Value of the Handle is Invalid
23	0x17	The Server Cannot Convert the Data
24	0x18	Requested Operation is not Allowed on Public Groups
25	0x19	The Items access Rights do not Allow the Operation
26	0x1a	The Address does not Exist
27	0x1b	Syntax Error in Address
28	0x1c	The Filter String was not Valid
29	0x1d	The Items Access Path is Unknown
30	0x1e	The Value was Out of Range
31	0x1f	Duplicate Name not Allowed
32	0x20	Server does not Support Requested Data Rate
33	0x21	Attempted Write to Clamped Output
34	0x22	Operation Failed because the Object is In Use
35	0x23	Server Invalid Configuration File Format
36	0x24	Requested Object was not Found