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email pdf with encryption not working

jason May 06, 2019 06:41AM MDT

How can I troubleshoot this issue further?
The following errors occurred:\n\n - Failed to encrypt the file: 'INCOME TAX RETURN.pdf'\n\n*Check that the file(s) are not open or in the viewer and try again.

The file is not open in another window and I found a forum to troublehsoot but all options are not applicable:

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