An alternative to taking screenshot of an error message generated by Dynamics NAV is to copy the text.  This can be achieved by using keyboard shortcut CTRL + C (Copy)  on the Error. This is ideal for copying and pasting error messages when raising a support query where screenshot capture is not possible.

Example

Select the error, CTRL = C , Paste (CTRL + V )

Result:

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Microsoft Dynamics NAV Classic
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There is nothing to post.
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OK
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