From the menu bar on the desktop, click Go > Go to Folder.
When you try to attach a PDF to email using the Attach to Email icon in Acrobat on macOS Mojave, Acrobat crashes with the following error message: “Acrobat Pro quit unexpectedly”.
This usually happens due to one of the following reasons:
To resolve the problem, try the following steps:
From the menu bar on the desktop, click Go > Go to Folder.
In the Go to Folder dialog box, enter /private/var in the text field, and then click GO.
Using the search box at the upper right corner of the dialog box, search for "SendMail". (Ensure that you select the “Var” folder, else it may not find it.)
Move the SendMail folder to Trash.
Now close Acrobat and relaunch it. (It'll re-create the SendMail folder, and that should fix the problem.)
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