Method.Invoke failing with Parameter Count Mismatch

I am trying to invoke a generic method. The definition of the method is as follows:

public System.Collections.Generic.IList<T> Query<T>(string query, [string altUrl = ""])
where T : new()

This is from the SalesforceSharp library on github. I am trying to make an additional service layer over this call and am struggling to invoke it. See my code below.

public List<T> Query<T>()
    {
        //IList<Salesforce.Account> _returnList = null;
        IList<T> _returnList = null;
        Type _t = typeof(T);

        SqlBuilder _sb = new SqlBuilder();
        _sb.Table = _t.Name.ToString();
        foreach (PropertyInfo p in _t.GetProperties()) _sb.Fields.Add(p.Name.ToString());

        MethodInfo method = _Client.GetType().GetMethod("Query");
        method = method.MakeGenericMethod(_t);
        try
        {
            object[] _prms = new object[1];
            _prms[0] = _sb.SQL;
            _returnList = (IList<T>)method.Invoke(_Client, new object[] { _prms });
            //_returnList = _Client.Query<Salesforce.Account>(_sb.SQL);
        }
        catch { }
        return (List<T>)_returnList;
    }

If I run this i get a Parameter Count Mismatch exception on the method.invoke line, but i am confused because if i bring in the two uncommented lines and execute without the generic call it is working ok. I have tried many combinations of string arrays wrapped in object arrays, strings in strings, etc but can't get it to go. I thought maybe it was treating the second parameter as mandatory? but adding another object to my _prms array didnt work either.

Please help!

Thanks, Dom