Error 0x8004A020

Value: -2147180512 | 0x8004A020 | 2147786784

What does it mean ?

NETCFG_E_ALREADY_INITIALIZED  
Indicates that the INetCfgComponent interface is not expected to be initialized, but it is already initialized. For example, this code is returned if the INetCfgComponent interface is already initialized before the INetCfg::Initialize method has been called.
Value: 40992 | 0xA020 | 0b1010000000100000
UPNP_E_REQUIRED_ELEMENT_ERROR  
A required element is missing.
Value: 40992 | 0xA020 | 0b1010000000100000

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

StackOverflow

Other Errors for FACILITY_ITF