You probably have LR5 for which there are no more updates, and the catalog was created by LR6.
I found the problem.
LR5.7.1 is still installed on my MAC. On my task bar LR5 started as default Lightroom. Removed shortcut for LR5 and changed it to LR 2015 CC.
Also set the default LR to LR 2015 CC.
I need to remove LR5 so opening program does not get confused
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