Must declare variable - sql-server

Question

I have an error during the execution of my proc that I must declare my variable while this last variable is well declared
because I declared my variables in the proc
Proc Syntax
USE [Test]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[ADMIN_D] #LNK_Name nvarchar(60) ,#bdd varchar(50) ,#PS VARCHAR(80), #SCH SYSNAME = 'dbo'
AS
Declare #sqlm varchar(max)
Declare #sql1 nvarchar(max)
Declare #sql nvarchar(max)
Declare #sqlZ varchar(max)
Declare #LINK nvarchar(max)
Declare #LINK1 nvarchar(max)
Declare #LINK2 varchar(max)
--Declare #bdd varchar(35)
Declare #Login varchar(80)
Declare #Datetime datetime
SET NOCOUNT ON;
IF (ORIGINAL_LOGIN() IN (''))
BEGIN;
PRINT 'Déploiement interdit - Contactez l''équipe SQL ';
RETURN;
END;
SET #Datetime = Getdate()
SET #Login = system_user
SELECT #sql = Definition
FROM sys.procedures p
INNER JOIN sys.sql_modules m ON p.object_id = m.object_id
where name = #PS and p.schema_id = SCHEMA_ID(#SCH)
--BEGIN DISTRIBUTED TRAN
raiserror('--- Alim Z_CODESOURCE de Prod',0,1) WITH NOWAIT
SET #sqlZ = 'EXEC dbo.Z_CODESOURCE_Alim #NOM_OBJET = ''' + #PS + ''''
SET #LINK = N'EXEC (#sqlZ) AT ' + QUOTENAME(#LNK_Name);;
EXEC sp_executesql #LINK;
SET NOCOUNT OFF
IF EXISTS (SELECT TOP 1 1 FROM ADMIN_DEPLOY_BLOCK WHERE NOM_PS = #PS AND Nom_Schema = #SCH)
BEGIN
SELECT 'DEPLOIEMENT INTERDIT PAR ' + ACTEUR + '. RAISON: ' + RAISON
FROM ADMIN_DEPLOY_BLOCK
WHERE NOM_PS = #PS
AND Nom_Schema = #SCH;
PRINT 'Pas de déploiement !'
END
ELSE
BEGIN TRY
SET #sqlm = ' USE [' + #bdd + '];DELETE FROM METADATA WHERE NAME = '''+#PS+''''
SET #LINK = N'EXEC (#sqlm) AT ' + QUOTENAME(#LNK_Name);
EXEC sp_executesql #LINK ;
SET #sql1 = 'IF EXISTS (SELECT * FROM sys.objects WHERE type IN (''P'', ''FN'') AND name = '''+#PS+''' AND schema_id = ( select schema_id from sys.schemas WHERE name=''' + #SCH + ''' )) DROP PROCEDURE ' + #SCH + '.' + #PS
SET #sql1 = 'IF EXISTS (SELECT * FROM sys.objects WHERE type IN (''P'', ''FN'') AND name = '''+#PS+''') DROP PROCEDURE '+#PS
SET #sql1 = REPLACE(#sql1,'''','''''')
SET #sql1 = 'USE [' + #bdd + ']; EXEC(''' + #sql1 + ''')'
SET #LINK1 = N'EXEC (#sql1) AT ' + QUOTENAME(#LNK_Name) ;
EXEC sp_executesql #LINK1 ;
SET #sql = REPLACE(#sql,'''','''''')
SET #sql = 'USE [' + #bdd + ']; EXEC(''' + #sql + ''')'
SET #LINK2 = N'EXEC (#sql) AT ' + QUOTENAME(#LNK_Name) ;
EXEC sp_executesql #LINK2 ;
INSERT INTO LOG_DEPLOYPS (LOGIN, PS, DAT) values (#login, #PS, #datetime)
Print ''
Print ''
Print 'Déploiement effectuée avec succès'
--COMMIT TRAN
END TRY
BEGIN CATCH
Print ''
Print ''
Print 'Une erreur est survenue: ' + CAST(##ERROR AS VARCHAR(255))
SELECT
#PS AS ProcedureName
,ERROR_NUMBER() AS ErrorNumber
,ERROR_SEVERITY() AS ErrorSeverity
,ERROR_STATE() AS ErrorState
,ERROR_PROCEDURE() AS ErrorProcedure
,ERROR_LINE() AS ErrorLine
,ERROR_MESSAGE() AS ErrorMessage;
--ROLLBACK TRAN
END CATCH
END
Execute Proc
USE [Test]
GO
DECLARE #return_value int
EXEC #return_value = [dbo].[ADMIN_D]
#bdd = N'PROD',
#PS = N'SP_login',
#LNK_Name=N'uat-link'
SELECT 'Return Value' = #return_value
GO
Someone who can help me please
enter image description here
Run stored procedure on linked server (linked server name as variable)

Answer 1

The problem is these lines (and other places later on where you use the same pattern):
SET #LINK = N'EXEC (#sqlZ) AT ' + QUOTENAME(#LNK_Name);;
EXEC sp_executesql #LINK;
The sp_executesql function creates a new execution context that doesn't know about the #sqlZ variable. To get around this, there are additional arguments you must pass to the function to set up the variables and their values.