mac or windows? Which version?
Which exact version number of Lightroom (x.y.z)?
What is the exact wording of the error message you are getting?
What exactly do you mean by "I don't have access to Lightroom catalog".
Error message? If so please state the exact error message.
I am using Windows 2007. Lightroom CC 2015.1
I am not receiving an error message. When I go to click on my Library photos in files called 2014 or 2015, the link is not lit up, so I cannot access my photos. 2016 is OK.
You may have moved the images from the original location to some other place, you need to re-link the images with Lightroom catalog.
follow the article: How to find missing photos in Photoshop Lightroom