
�° want to use this code but when the page opens, I get a null reference error. When I open the page a second time, this error doesn't occur.
I understand when the site caches, this error doesn't occur. The error comes from tb_show function.
My code:
What should I do for it?

İ want to use this code but when the page opens, I get a null reference error. When I open the page a second time, this error doesn't occur.
I understand when the site caches, this error doesn't occur. The error comes from tb_show function.
My code:
What should I do for it?
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