Does anyone have experience of TDbf?

I want to change an existing record:

ival:=strtoint(ConFigs.Values['hubID']);
Dbf1.Open;
while not(Dbf1.EOF)do
begin
 if Dbf1.FieldByName('hubID').AsInteger=ival then
 begin
   Dbf1.FieldByName('Loc').AsString:=Configs.Values['Location'];
   Dbf1.FieldByName('EstName').AsString:=Configs.Values['Establishment'];
   Dbf1.FieldByName('NetwkName').AsString:=NetwkName;
   Dbf1.FieldByName('VATNo').AsString:=Configs.Values['VATNumber'];
   Dbf1.FieldByName('TelNo').AsString:=Configs.Values['TelNumber'];
   Dbf1.FieldByName('User').AsString:=username;
   Dbf1.Post;
 end;
 Dbf1.Next;
end;

Obviously ival has the value of the 'hubID' field of the record that I
want to update and I'd like to replace all the fields in the record
with new values.

However, I'm getting an error which says: "Project raised exception
class 'Unknown' "
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