Error in select statement using C# - Syntax error (missing operator) in query expression

Question

I have the following code:

string sSelect = @"select a.nume, a.cui, b.suma, b.perioada, c.nume_produs from client as a
                   left join client_produs as b on a.id_client = b.id_client
                   left join produs as c on b.id_produs = c.id_produs";
con.Open();
OleDbCommand cSelect = new OleDbCommand(sSelect, con);
OleDbDataReader clientsInfo = cSelect.ExecuteReader();

The purpose of the above select statement is to retrieve all the information stored in the database.

The problem is I am getting an error : "System.Data.OleDb.OleDbException: 'Syntax error (missing operator) in query expression 'a.id_client = b.id_client left join produs as c on b.id_produs = c.id_produs'.'"

I cannot find the reason why and any help would be appreciated.