Update specific column in all tables base on specific value - sql

Question

I'm trying to update all table based on my value. This is a script Task in my SSIS package.
But I get the error:
Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done.
Code looks like this:
DECLARE #Column_name varchar(MAX)
DECLARE #Column_Datatype varchar(max)
SET #COLUMN_NAME='site_id'
SET #COLUMN_DATATYPE='varchar(10)'
------------------------------------------------Code---------------------------------------------------
GO
--Declare Variables
DECLARE #TableName VARCHAR(100)
DECLARE #TableSchema VARCHAR(100)
DECLARE #COLUMN_NAME VARCHAR(50)
DECLARE #COLUMN_NAME_UPDATE VARCHAR(50)
SET #COLUMN_NAME_UPDATE = ?
SET #COLUMN_NAME='site_id'
DECLARE #COLUMN_DATATYPE VARCHAR(50)
SET #COLUMN_DATATYPE='varchar(max)'
--Declare Cursor
DECLARE CUR CURSOR FOR
SELECT TABLE_SCHEMA,
TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE'
--OPEN CURSOR
OPEN CUR
--Fetch First Row
FETCH NEXT FROM CUR INTO #TableSchema,#TableName
--Loop
WHILE ##FETCH_STATUS = 0
BEGIN
DECLARE #SQL NVARCHAR(MAX)
SET #SQL= ( SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME=#TableName AND COLUMN_NAME=#COLUMN_NAME
and Table_Schema=#TableSchema)
BEGIN
SET #SQL='UPDATE '+ #TableSchema+'.'+ '[' + #TableName + ']' + ' SET '+#COLUMN_NAME + '='
+ '''' + #COLUMN_NAME_UPDATE + '''' + 'WHERE site_id IS NULL '
PRINT #SQL
EXEC ( #SQL)
END
FETCH NEXT FROM CUR INTO #TableSchema,#TableName
END
--Close and Deallocate Cursor
CLOSE CUR
DEALLOCATE CUR
I use a variable like input.
What's wrong?