How to Merge Two Worksheet_Change Codes

Hi,
I am trying to merge two VBA codes;

Code1:

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Code2:

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I have asked this other forums and someone send me below code. It works fine for 2 times but then it shows error on Application.Undo.

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It looks like i have to change something but i couldn't find. Is there anyone to explain?

Thanks!

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Administrative Note:

Welcome to the forum.

We would very much like to help you with your query, however you need to include code tags around your code.

Please take a moment to add the tags. Posting code between [CODE]Please [url=https://www.excelforum.com/login.php]Login or Register [/url] to view this content.[/CODE] tags makes your code much easier to read and copy for testing, and it also maintains VBA formatting.

Click on Edit to open your post, then highlight your code and click the # icon at the top of your post window. More information about these and other tags can be found here

In addition please upload the workbook so we may see the request in context.