Error 0x800721B4

Value: -2147016268 | 0x800721B4 | 2147951028

What does it mean ?

ERROR_DS_HIERARCHY_TABLE_TOO_DEEP  
The address books are nested too deeply. Failed to build the hierarchy table.
Value: 8628 | 0x21B4 | 0b0010000110110100

Where does it come from ?

FACILITY_WIN32  
Provides a way to handle error codes from functions in the Win32 API as an HRESULT. (Error codes in 16 - bit OLE that duplicated Win32 error codes have also been changed to FACILITY_WIN32)
Value: 7 | 0x007 | 0b00000111

Other Errors for FACILITY_WIN32