This can help to fix the issue when you try to open a pdf file and you are getting the below errors:
Solution
To fix the problem on Adobe Acrobat Reader DC version 2019 and above, please go to the Edit->Preferences->Security (Enhanced) page and uncheck the setting that says "Run in AppContainer" under the Sandbox Protections heading. Hit Ok.
After restarting Adobe Acrobat Reader, you will be able to open PDF files directly.