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We're happy to take a look, but as per the forum rules, please link to a test case - a test case that replicates the issue will ensure you'll get a quick and accurate response. Information on how to create a test case (if you aren't able to link to the page you are working on) is available here. Cheers, Colin

Did you follow the troubleshooting steps found at the link in the error? https://datatables.net/manual/tech-notes/18 Kevin

@allan Thanks a lot! Happened!

The place to start is to follow the troubleshooting steps found at the link in the error: https://datatables.net/manual/tech-notes/18 Let us know what you find. Kevin

We're happy to take a look, but as per the forum rules, please link to a test case - a test case that replicates the issue will ensure you'll get a quick and accurate response. Information on how to create a test case (if you aren't able to link to the page you are working on) is available here. Cheers, Colin

Please read over this tech note about how to ask for help. You are going to have to give us just a bit more information than the error message to let us be able to offer you any help. Like a link to a test case which is asked for in the forum rules, the new post page and the template text that you haven't filled in. Allan

:( :( :( :( :( :( :( :( :( Why didn't I see this error!!! Many thanks. In my first release I get the error of missing $_POST['draw'] and I think that is the reason why I have it hard-coded. Now it works.

Yes, sorry we didn't get back to you. I think it is possible through a combination of ColReorder and FixedColumns' fixedColumns().left() method, which you can use to get / set the number of fixed columns. But it isn't something I've tried before, so I can't say for certain if it would work or not. Allan

Thanks Kevin

Thank you and it got worked for export button.