script for insert sequences

Hello,

I try to do a script for transfer the sequences from a db to another db. Ihave these errors :
Msg 102, Level 15, State 1, Procedure vcf_transfer_sequences, Line 50
Incorrect syntax near '+ @Dbsource + '.
Msg 137, Level 15, State 2, Procedure vcf_transfer_sequences, Line 56
Must declare the scalar variable "@Schsource".

Do you have a solution ?
CREATE PROCEDURE [dbo].[move_sequences]
@Srvsource varchar (30),
@Dbsource varchar(30),
@DbDest varchar(30),
@SchDest varchar(30),
@Pwd varchar (30)

AS

EXEC master.dbo.sp_addlinkedserver @server = @Srvsource, @srvproduct=N'SQL Server'
 /* For security reasons the linked server remote logins password is changed with ######## */

declare @sql1 nvarchar(max);
set @sql1 = 'EXEC master.dbo.sp_addlinkedsrvlogin @rmtsrvname =N''' + @Srvsource + ''', @useself=N''False'',@locallogin=NULL,@rmtuser=''sa'',@rmtpassword=''' +@Pwd + ''' '
exec sp_executesql @sql1

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'collation compatible', @optvalue=N'false'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'data access', @optvalue=N'true'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'dist', @optvalue=N'false'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'pub', @optvalue=N'false'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'rpc', @optvalue=N'true'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'rpc out', @optvalue=N'true'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'sub', @optvalue=N'false'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'connect timeout', @optvalue=N'0'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'collation name', @optvalue=null

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'lazy schema validation', @optvalue=N'false'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'query timeout', @optvalue=N'0'

EXEC master.dbo.sp_serveroption @server=@Srvsource, @optname=N'use remote collation', @optvalue=N'true'

declare @sql varchar(max)
set @sql = 'INSERT INTO ['+@DbDest+ '].'+ [dbo].[SEQUENCE]
           ([name]
           ,[usr]
           ,[value]
                  )

select [name], [usr], [value] FROM ['+@Srvsource + '].'+ @Dbsource + '.'[dbo].[SS_SEQUENCE] where [usr] = '@Schsource''
execute (@sql)
print (@sql)

UPDATE [dbo].[SEQUENCE]
SET [usr] = @Schdest
where [usr] = @Schsource

IF  EXISTS (SELECT srv.name FROM sys.servers srv WHERE srv.server_id != 0
AND srv.name = @Srvsource)
EXEC master.dbo.sp_dropserver @server=@Srvsource, @droplogins='droplogins'

Thanks

bibi