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There is a crash or error when I want to send projects by e-mail.
If this happens only while exporting as e-mail (and not while exporting as file), then this is a problem of your windows mail settings.
You can solve this by resetting these settings. For this you need to make another e-mail client the "Default e-mail client" and then your original e-mail client again. For example you can change this in Outlook on the first page of the Outlook options.
A Windows restart is also worth a try.