I got this error while executing the database query 'could not load file or assembly 'microsoft.sqlserver.batchparserclient version=12.0.0.0'

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SQL

C#3.5

I got this error while executing the database Query
'could not load file or assembly 'microsoft.sqlserver.batchparserclient version=12.0.0.0'
Here I am using sql server 2008 R2 I installed all the smo objects.

Here is the code

try
           {
               string sqlConnectionString = cn.ConnectionString.ToString();
               SqlConnection conn = new SqlConnection(sqlConnectionString);
               StringBuilder sb = new StringBuilder();
               string script = string.Empty;
               Microsoft.SqlServer.Management.Smo.Server server = new Server(new ServerConnection(conn));
               string mappath = Path.Combine(Application.StartupPath.ToString(), "Scripts");
               var files = Directory.GetFiles(@"" + mappath + "", "*.sql").OrderBy(f => int.Parse(Path.GetFileNameWithoutExtension(f)));
               //string[] filePaths = Directory.GetFiles(@"" + mappath + "", "*.sql");
               try
               {
                   foreach (string pa in files)
                   {
                       script = File.ReadAllText(pa);
                       int counter = 0;
                       string line;
                       if (pa == mappath + @"\4.sql" || pa == mappath + @"\7.sql" || pa == mappath + @"\8.sql" || pa == mappath + @"\10.sql" || pa == mappath + @"\13.sql" || pa == mappath + @"\14.sql" || pa == mappath + @"\16.sql" || pa == mappath + @"\100.sql")
                       {
                           // Read the file and display it line by line.
                           System.IO.StreamReader file =
                              new System.IO.StreamReader(pa);
                           while ((line = file.ReadLine()) != null)
                           {
                               cmd = new SqlCommand(line);
                               cmd.Connection = conn;
                               cmd.CommandTimeout = 1000;
                               try
                               {
                                   cmd.ExecuteNonQuery();
                               }
                               catch (Exception Ex)
                               {
                                   sb.Append(line);
                                   sb.AppendLine();
                               }
                               counter++;
                           }
                           file.Close();
                       }
                       else if (pa == mappath + @"\02.sql")
                       {
                       }
                       else
                       {
                           try
                           {
                               //cmd = new SqlCommand(script);
                               //cmd.Connection = conn;
                               //cmd.CommandTimeout = 1000;
                               //cmd.ExecuteNonQuery();
                               server.ConnectionContext.ExecuteNonQuery(script); //<big>Getting error Here</big>
                           }
                           catch (Exception EX) { IsFailed = true; }
                       }

                   }
                   //conn.ChangeDatabase("master");
                   conn.Close();
               }
               catch (Exception Ex) { }

What I have tried:

I installed smo objects from this link https://www.microsoft.com/en-us/download/details.aspx?id=26728