Conversion Failed When Converting The Nvarchar Value

Okay, I have the following store procedure and I kept getting an error.





Code Block
ALTER PROCEDURE [dbo].[Search]
-- Add the parameters for the stored procedure here
@schoolID int = NULL,
@scholarship varchar(250) = NULL,
@major varchar(250) = NULL,
@requirement varchar(250) = NULL,
@debug bit = 0
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
Declare @SQL as Varchar(4000);
Declare @Params as Varchar(3000);
Set @SQL = N'SELECT * FROM [scholarship] WHERE [sectionID] = ' + @schoolID;
Set @Params = N'@scholarship VARCHAR(250),@major VARCHAR(250),@requirement VARCHAR(250)'
If @scholarship IS NOT NULL
Set @SQL = @SQL + N' AND [scholarship].[schlrName] LIKE + ''%'' + @scholarship + ''%'''
If @major IS NOT NULL
Set @SQL = @SQL + N' AND [scholarship].[Specification] LIKE + ''%'' + @last + ''%'''
If @requirement IS NOT NULL
Set @SQL = @SQL + N' AND ([scholarship].[reqr1] LIKE + ''%'' + @requirement + ''%'''
If @requirement IS NOT NULL
Set @SQL = @SQL + N' OR [scholarship].[reqr2] LIKE + ''%'' + @requirement + ''%'''
If @requirement IS NOT NULL
Set @SQL = @SQL + N' OR [scholarship].[reqr3] LIKE + ''%'' + @requirement + ''%'''
If @requirement IS NOT NULL
Set @SQL = @SQL + N' OR [scholarship].[reqr4] LIKE + ''%'' + @requirement + ''%'''
If @requirement IS NOT NULL
Set @SQL = @SQL + N' OR [scholarship].[reqr5] LIKE + ''%'' + @requirement + ''%'')'
If @debug = 1
PRINT @SQL
Exec sp_executesql @SQL, @Params, @scholarship, @major, @requirement
END




And I kept getting this error:


Msg 245, Level 16, State 1, Procedure Search, Line 28

Conversion failed when converting the nvarchar value 'SELECT * FROM [scholarship] WHERE [sectionID] = ' to data type int.

Any help is much appreciated.