INSERT EXEC Statement Cannot Be Nested

Question

I AM GETTING THE FOLLOWING PROBLEM WHEN I EXECUTE THIS QUERY:
DECLARE @i INT
DECLARE @Lenght INT;
DECLARE @Publication VARCHAR(MAX)
DECLARE @ReplicationMonitor  TABLE 
id int identity,
status int
,warning int
,subscriber sysname null
,subscriber_db sysname
,publisher_db sysname
,publication sysname
,publication_type int
,subtype int
,latency int
,latencythreshold int
,agentnotrunning int
,agentnotrunningthreshold int
,timetoexpiration int
,expirationthreshold int            
,last_distsync datetime
,distribution_agentname sysname  null
,mergeagentname sysname null
,mergesubscriptionfriendlyname sysname null
,mergeagentlocation sysname null
,mergeconectiontype int
,mergePerformance int null
,mergerunspeed float null 
,mergerunduration int null
,monitorranking int       
,distributionagentjobid  binary(16) null
,mergeagentjobid binary(16) null
,distributionagentid int null
,distributionagentprofileid int null
,mergeagentid int null
,mergeagentprofileid int null
,logreaderagentname sysname null           
,publisher sysname null           
DECLARE @Publications table
Id INT IDENTITY ,
Publication VARCHAR (MAX )
INSERT INTO @Publications (Publication)
SELECT Name FROM sysmergepublications
SET @i =  (SELECT MIN (Id) FROM @Publications);
SET @Lenght = (SELECT COUNT (*) FROM @Publications);
WHILE (@i <= @Lenght)
BEGIN
SELECT @Publication = Publication
FROM @Publications WHERE Id = @i;
BEGIN TRY
BEGIN TRANSACTION
INSERT INTO @ReplicationMonitor 
EXEC [distribution].dbo.sp_replmonitorhelpsubscription 
@publication = @Publication,
@publisher =  '',
@publisher_db =  '',
@publication_type = 2
COMMIT TRANSACTION
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION;
PRINT ERROR_MESSAGE(); 
END CATCH
SET @i = @i + 1;
END;
SELECT * FROM @ReplicationMonitor
SO, IF YOU CAN HELP ME ILL BE APRECIATE IT, AND THANK YOU A LOT !!!

Answer 1

As i mentioned you, i have found a solution for this issue, the solution is very strange because for me... it is a sql server bug and i cannot explaint but... i have discovered that we have to execute the procedure lonely before to execute it on the loop..
but why ? i dont know actually.
i cannot give you an explain for this strange behavior but it have resolved my problem.....
in my case the first execution does not throws any problem because i send null values inthe parameters, so i am performing a validation on the table variable when the result set from´is inserted on it from the procedure execution on the loop, for this reaseon
the first execution it does not matter.
The code......
DECLARE @i INT
DECLARE @Lenght INT;
DECLARE @Publication VARCHAR(MAX)
DECLARE @Query NVARCHAR(MAX)
DECLARE @Database NVARCHAR(50);
DECLARE @Server NVARCHAR(50);
SET @Database =DB_NAME();
SET @Server  =@@SERVERNAME;
DECLARE @ReplicationMonitor  TABLE 
--id int identity,
status int
,warning int
,subscriber sysname null
,subscriber_db sysname
,publisher_db sysname
,publication sysname
,publication_type int
,subtype int
,latency int
,latencythreshold int
,agentnotrunning int
,agentnotrunningthreshold int
,timetoexpiration int
,expirationthreshold int            
,last_distsync datetime
,distribution_agentname sysname  null
,mergeagentname sysname null
,mergesubscriptionfriendlyname sysname null
,mergeagentlocation sysname null
,mergeconectiontype int
,mergePerformance int null
,mergerunspeed float null 
,mergerunduration int null
,monitorranking int       
,distributionagentjobid  binary(16) null
,mergeagentjobid binary(16) null
,distributionagentid int null
,distributionagentprofileid int null
,mergeagentid int null
,mergeagentprofileid int null
,logreaderagentname sysname null           
,publisher sysname null           
DECLARE @Publications table
Id INT IDENTITY ,
Publication VARCHAR (MAX )
SET NOCOUNT ON;
INSERT INTO @Publications (Publication)
SELECT Name FROM sysmergepublications
SET NOCOUNT OFF;
SET @i =  (SELECT MIN (Id) FROM @Publications);
SET @Lenght = (SELECT COUNT (*) FROM @Publications);
THIS IS THE PARTE THAT I HAVE MENTIONED BELOW..
EXECUTE distribution.dbo.sp_replmonitorhelpsubscription 
@publication = null,
@publisher =  null,
@publisher_db =  null,
@publication_type = 0
YOU HAVE TO EXECUTED LONELY
WHILE (@i <= @Lenght)
BEGIN
SELECT @Publication = Publication
FROM @Publications WHERE Id = @i;
BEGIN TRY
BEGIN TRANSACTION
SET NOCOUNT ON;
INSERT @ReplicationMonitor
EXECUTE distribution.dbo.sp_replmonitorhelpsubscription 
@publication = @Publication,
@publisher =  @Server,
@publisher_db = @Database ,
@publication_type = NULL
SET NOCOUNT OFF;
COMMIT TRANSACTION
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION;
PRINT ERROR_MESSAGE(); 
END CATCH
SET @i = @i + 1;
END;
SELECT * FROM @ReplicationMonitor
SET NOCOUNT OFF;
NOTE: MAY BE IN YOUR CODE THE FIRST OUTPUT EXECUTION CAUSE A PROBLEM, BUT THIS RESOLVE MY ISSUE, I KNOW THAT IS NOT THE BEST MANNER TO PERFORM THIS, FOR I WANT TO BE CLEAR THAT IN MY CASE IT WORKED !
You can try this solution with your own tables or executing another system procedure to test this.