I’m new to CC and was having the same problem. The problem was that I had only installed Premiere Pro CC and not the older version. Both must be downloaded and installed, even though they don’t tell you that.
To download the older version: open the CC access app (or whatever they call it)>click “Apps” on the top menu>click “all app” dropdown menu which is next to “Find New Apps”>select “Audio/Video”>click “Audio/Video” dropdown menu>select “Previous Versions”>find and install Premiere Pro.
This worked for me. Good luck.
Don