Please follow the steps provided in the below link.
Also, please mention the operating system you are using.
Hope this helps.
Why are you still using Lightroom 5.6 and not using Lightroom CC 2015.3? That is the version you should be running if you are using the creative cloud. Your Lightroom 5.6 might be an older standalone installation.
Your Lightroom 5.6 might be an older standalone installation.
There ya go - a recurring theme in many other posts that come up with a search for the message...
Yeah, you're right. But it seems that no one ever reads those related links or the forum search tool anyway.