I am running Mac Os Sierra Version 10:12:6
And ever since I updated my Adobe Acrobat Reader DC Version 2017.012.20098 I have been getting an error sign of
RdrCEF quit unexpectedly when I try to open pdf. files that I was previously able to open .
Then it tells me to report it to Apple but it does not fix the situation.
Thanks for your help and please when you answer remember I am not an computer expert.
We apologize for the delay in response to your query.
If you are still experiencing the same problem then you may try updating the application to the latest version.
We have the latest patch released for the Acrobat in our December release- Release Notes | Adobe Acrobat, Reader
Update the Acrobat application to the latest version and see if that helps resolving the error sign.