Invalid Object Name - #temptable - sql-server

Question

This stored procedure creates a table in the database when I make the select * into, and because of that, when there is more than one user, an error appears and says SearchTMP table already exists, this happens even if I make a drop of that table. So I decided to make a temporary table, as the following code shows:
INSERT INTO #SQLTbl(Tablename, WHEREClause)
SELECT QUOTENAME(SCh.name) + '.' + QUOTENAME(ST.NAME),
(
SELECT '[' + SC.Name + ']' + ' LIKE ''' + REPLACE(SearchSTR.SearchString,'''','''''') + ''' OR ' + CHAR(10)
FROM SYS.columns SC
JOIN SYS.types STy
ON STy.system_type_id = SC.system_type_id
AND STy.user_type_id =SC.user_type_id
CROSS JOIN #SearchStringTbl SearchSTR
WHERE STY.name in ('varchar','char','nvarchar','nchar','text')
AND SC.object_id = ST.object_id
ORDER BY SC.name
FOR XML PATH('')
)
FROM SYS.tables ST
JOIN #CheckTableNames chktbls
ON chktbls.Tablename = ST.name
JOIN SYS.schemas SCh
ON ST.schema_id = SCh.schema_id
AND Sch.name = chktbls.Schemaname
WHERE ST.name <> '#MyTempTable' -- it was SearchTMP
GROUP BY ST.object_id, QUOTENAME(SCh.name) + '.' + QUOTENAME(ST.NAME);
UPDATE #SQLTbl SET SQLStatement = 'SELECT * INTO #MyTempTable FROM ' + Tablename + ' WHERE ' + substring(WHEREClause,1,len(WHEREClause)-5)
Since I didn't want to declare or create the table previously, the temptable will be created in the select * into. But when I try to run the procedure by filling the parameters it says:
>Msg 208, Level 16, State 0, Procedure SP_SearchTables_TEST, Line 265, Invalid object name #MyTempTable
The entire stored procedure:
ALTER PROCEDURE [dbo].[SearchTables_TEST] #SearchStr NVARCHAR(60) ,#GenerateSQLOnly Bit = 0 ,#SchemaNames VARCHAR(500) ='%' AS
SET NOCOUNT ON
DECLARE #MatchFound BIT
SELECT #MatchFound = 0
DECLARE #CheckTableNames Table
(
Schemaname sysname
,Tablename sysname
)
DECLARE #SearchStringTbl TABLE
(
SearchString VARCHAR(500)
)
DECLARE #SQLTbl TABLE
(
Tablename SYSNAME
,WHEREClause VARCHAR(MAX)
,SQLStatement VARCHAR(MAX)
,Execstatus BIT
)
DECLARE #SQL VARCHAR(MAX)
DECLARE #TableParamSQL VARCHAR(MAX)
DECLARE #SchemaParamSQL VARCHAR(MAX)
DECLARE #TblSQL VARCHAR(MAX)
DECLARE #tmpTblname sysname
DECLARE #ErrMsg VARCHAR(100)
IF LTRIM(RTRIM(#SchemaNames)) =''
BEGIN
SELECT #SchemaNames = '%'
END
IF CHARINDEX(',',#SchemaNames) > 0
SELECT #SchemaParamSQL = 'SELECT ''' + REPLACE(#SchemaNames,',','''as SchemaName UNION SELECT ''') + ''''
ELSE
SELECT #SchemaParamSQL = 'SELECT ''' + #SchemaNames + ''' as SchemaName '
SELECT #TblSQL = 'SELECT SCh.NAME,T.NAME
FROM SYS.TABLES T
JOIN SYS.SCHEMAS SCh
ON SCh.SCHEMA_ID = T.SCHEMA_ID
INNER JOIN [DynaForms].[dbo].[Enums_Tables] et on
(et.Id = T.NAME COLLATE Latin1_General_CI_AS) '
INSERT INTO #CheckTableNames
(Schemaname,Tablename)
EXEC(#TblSQL)
IF NOT EXISTS(SELECT 1 FROM #CheckTableNames)
BEGIN
SELECT #ErrMsg = 'No tables are found in this database ' + DB_NAME() + ' for the specified filter'
PRINT #ErrMsg
RETURN
END
IF LTRIM(RTRIM(#SearchStr)) =''
BEGIN
SELECT #ErrMsg = 'Please specify the search string in #SearchStr Parameter'
PRINT #ErrMsg
RETURN
END
ELSE
BEGIN
SELECT #SearchStr = REPLACE(#SearchStr,',,,',',#DOUBLECOMMA#')
SELECT #SearchStr = REPLACE(#SearchStr,',,','#DOUBLECOMMA#')
SELECT #SearchStr = REPLACE(#SearchStr,'''','''''')
SELECT #SQL = 'SELECT ''' + REPLACE(#SearchStr,',','''as SearchString UNION SELECT ''') + ''''
INSERT INTO #SearchStringTbl
(SearchString)
EXEC(#SQL)
UPDATE #SearchStringTbl
SET SearchString = REPLACE(SearchString ,'#DOUBLECOMMA#',',')
END
INSERT INTO #SQLTbl(Tablename,WHEREClause)
SELECT QUOTENAME(SCh.name) + '.' + QUOTENAME(ST.NAME),
(
SELECT '[' + SC.Name + ']' + ' LIKE ''' + REPLACE(SearchSTR.SearchString,'''','''''') + ''' OR ' + CHAR(10)
FROM SYS.columns SC
JOIN SYS.types STy
ON STy.system_type_id = SC.system_type_id
AND STy.user_type_id =SC.user_type_id
CROSS JOIN #SearchStringTbl SearchSTR
WHERE STY.name in ('varchar','char','nvarchar','nchar','text')
AND SC.object_id = ST.object_id
ORDER BY SC.name
FOR XML PATH('')
)
FROM SYS.tables ST
JOIN #CheckTableNames chktbls
ON chktbls.Tablename = ST.name
JOIN SYS.schemas SCh
ON ST.schema_id = SCh.schema_id
AND Sch.name = chktbls.Schemaname
WHERE ST.name <> '#MyTempTable' -- it was SearchTMP
GROUP BY ST.object_id, QUOTENAME(SCh.name) + '.' + QUOTENAME(ST.NAME);
UPDATE #SQLTbl SET SQLStatement = 'SELECT * INTO #MyTempTable FROM ' + Tablename + ' WHERE ' + substring(WHEREClause,1,len(WHEREClause)-5)
DELETE FROM #SQLTbl
WHERE WHEREClause IS NULL
DECLARE #output TABLE (Id VARCHAR(50), Name VARCHAR(100))
WHILE EXISTS (SELECT 1 FROM #SQLTbl WHERE ISNULL(Execstatus ,0) = 0)
BEGIN
SELECT TOP 1 #tmpTblname = Tablename , #SQL = SQLStatement
FROM #SQLTbl
WHERE ISNULL(Execstatus ,0) = 0
IF #GenerateSQLOnly = 0
BEGIN
IF OBJECT_ID('#MyTempTable','U') IS NOT NULL -- this line was uncomment
DROP TABLE #MyTempTable -- this line was uncomment
EXEC (#SQL)
IF EXISTS(SELECT 1 FROM #MyTempTable) -- It was like this: SearchTMP
BEGIN
SELECT #MatchFound = 1
INSERT INTO #output (Id, Name)
Select * from [DynaForms].[dbo].[Enums_Tables] where id in (SELECT parsename(#tmpTblname,1) FROM #MyTempTable) -- It was like this: SearchTMP
END
END
ELSE
BEGIN
PRINT REPLICATE('-',100)
PRINT #tmpTblname
PRINT REPLICATE('-',100)
PRINT replace(#SQL,'INTO #MyTempTable','')
END
UPDATE #SQLTbl
SET Execstatus = 1
WHERE Tablename = #tmpTblname
END
SELECT * FROM #output
IF #MatchFound = 0
BEGIN
SELECT #ErrMsg = 'No Matches are found in this database ' + DB_NAME() + ' for the specified filter'
PRINT #ErrMsg
RETURN
END
SET NOCOUNT OFF

Answer 1

OK, so a quick test actually answered this, and i can't believe I missed this (/facepalm). you can't use a INTO clause with dynamic SQL and a Temporary table and reference it afterwards; you need to CREATE the table. Consider the following:
DECLARE #SQL varchar(max);
SET #SQL = 'SELECT 1 AS A, 2 AS B INTO #test;';
EXEC (#SQL);
SELECT *
FROM #test;
DROP TABLE #test;
This returns the error:
Msg 208, Level 16, State 0, Line 5
Invalid object name '#test'.
And now, for the correct way:
DECLARE #SQL varchar(max);
CREATE TABLE #test (A int, B int);
SET #SQL = 'INSERT INTO #test SELECT 1 AS A, 2 AS B';
EXEC (#SQL);
SELECT *
FROM #test;
DROP TABLE #test;
This works fine. Thus, you need to CREATE your temporary table, not use an INTO clause.

Answer 2

Instead of
Object_Id('#MyTempTable','U')
You need to use
Object_Id('tempdb..#MyTempTable','U')
To get the object_id of the temporary table to check if it exists or not.
Temp tables are created in TempDB system database