OUTPUT variables to sp_executesql - stored-procedures

Question

Background: SQL Server 2008 R2
Having issues with the following. Been given a usp to "finish off", author is unavailable. It extracts data from source table, copies to target table of same name + datetime stamp in an archive db then truncates source table. Want to confirm that no errors have occurred & row counts are the same before I truncate source. As I'm using DDL a TRY CATCH combo won't work.
Following code works:
DECLARE #HostName VARCHAR(30) -- Name of server running script
DECLARE #dbName VARCHAR(30) -- Database currently connected to
DECLARE #LogText VARCHAR(255) -- Text to be logged to ArchLog table
DECLARE #NewUTMetaData VARCHAR(255) -- New tablename for UTMetaData
DECLARE #NewOutboundMessagePending VARCHAR(255) -- New tablename for OutboundMessagePending
DECLARE #NewOutboundMessageStatus VARCHAR(255) -- New tablename for OutboundMessageStatus
DECLARE #NewOutboundMessageResult VARCHAR(255) -- New tablename for OutboundMessageResult
DECLARE #NewFileMessageNonSequence VARCHAR(255) -- New tablename for FileMessageNonSequence
DECLARE #NewOutboundMessageRequest VARCHAR(255) -- New tablename for OutboundMessageRequest
DECLARE #NewOutboundMessage VARCHAR(255) -- New tablename for OutboundMessage
DECLARE #SQLQuery NVARCHAR(500)
DECLARE #return_value INT
DECLARE #Err INT = 0
DECLARE #ErrFin INT = 0
DECLARE #SQLCount NVARCHAR(255) = 'SELECT #TargetCountOUT = COUNT(*) FROM '
DECLARE #ParmDefinition nvarchar(50) = N'#TargetCountOUT int OUTPUT';;
DECLARE #SourceCount INT = 0
DECLARE #TargetCount INT = 0
-- Log message that delete is starting
SELECT #HostName = host_name()
SELECT #dbName = db_name()
SELECT #LogText = 'Procedure ArchiveMuleDBMetrix_NEW starting database= ' + #dbname + ' host= ' + #HostName
EXEC xp_logevent 50001, #LogText, 'INFORMATIONAL'
INSERT INTO [MuleDBArch].[dbo].[ArchLog]
([LogEntryDateTime]
,[LogEntry])
VALUES (GETDATE()
,#LogText)
BEGIN
SELECT #NewUTMetaData = (SELECT '[MuleDBArch].[dbo].UTMetaDataA' + convert(varchar(50),GetDate(),112) + replace(convert(varchar, GetDate(),108),':',''))
SET #err = ##error;
SET #SQLQuery = 'select * into ' + #NewUTMetaData + ' from [MuleDB].[dbo].[SASITUTMetaData]'
EXECUTE sp_executesql #SQLQuery
SET #SourceCount = ##ROWCOUNT
SELECT #LogText = 'Rows archived into ' + #NewUTMetaData + ' by Procedure ArchiveMuleDBMetrix_NEW = ' + CAST(#SourceCount as VARCHAR(6))
EXEC xp_logevent 50002, #LogText, 'INFORMATIONAL'
INSERT INTO [MuleDBArch].[dbo].[ArchLog]
([LogEntryDateTime]
,[LogEntry])
VALUES (GETDATE()
,#LogText)
IF #err = 0
BEGIN
SET #sqlcount = #sqlcount + #NewUTMetaData
EXECUTE sp_executesql #sqlcount, #ParmDefinition, #TargetCountOUT=#TargetCount OUTPUT;
IF #SourceCount = #TargetCount
TRUNCATE TABLE [MuleDB].[dbo].[SASITUTMetaData]
ELSE
SELECT #LogText = 'Post archive, row counts differ between [MuleDB].[dbo].[SASITUTMetaData] and' + #NewUTMetaData
EXEC xp_logevent 50003, #LogText, 'Error'
Set #errfin = 1
SET #err = 0
END
ELSE
BEGIN
SELECT #LogText = 'Procedure ArchiveMuleDBMetrix_NEW failed archiving into ' + #NewUTMetaData
EXEC xp_logevent 50004, #LogText, 'Error'
Set #errfin = 1
SET #err = 0
END
END
However, if I repeat the block to work on another table (or indeed the same one) query completes with error and I get the message:
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near '.'.
I think I've narrowed it down to the line:
EXECUTE sp_executesql #sqlcount, #ParmDefinition, #TargetCountOUT=#TargetCount OUTPUT;
Any help appreciated

Answer 1

In the below code
EXECUTE sp_executesql #sqlcount, #ParmDefinition, #TargetCountOUT=#TargetCount OUTPUT;
You are trying to pass parameter values without specifying the parameter names except the output parameter while calling the stored procedure. Either specify the parameter name for all or none. Try to execute the code as follows
EXECUTE sp_executesql #sqlcount, #ParmDefinition, #TargetCount OUTPUT;