Why would SetLocation on an Oracle database result in COMException 0x80047E4C?

CR version XI release 2

The description of the error is this:

De database gegevens kunnen niet worden geladen, which translated to English is something like this:

The database data cannot be loaded.

I'm puzzled as to what might cause this behavior.

The fragment of code resulting in the error works fine normally.

table.DllName = "crdb_oracle.dll";

SetProperty(table, "Server", _dataServiceSettings.DatabaseName); -> tns names reference

SetProperty(table, "Database Type", "OLE DB");

SetProperty(table, "UserId", _dataServiceSettings.DatabaseUserName);

SetProperty(table, "User ID", _dataServiceSettings.DatabaseUserName);

SetProperty(table, "Password", _dataServiceSettings.DatabasePassword);

table.Location = string.Concat(_dataServiceSettings.DatabaseUserName.ToUpper(), ".", table.Location.ToUpper());

Could anyone shed any light on this case for me to be able to solve it?

Thanks in advance,

Henk Spaan.