Export to lightroom

I have had PL 5 for almost a year, now.
It has worked well with Lightroom Classic
It is now not exporting to Lightroom classic
I get a message saying Lightroom catalogue is corrupt, but, it’s not because all my other programmer are working fine with it.
Also the list of catalogues on the left of work page has no info in the centre column
I can export to a folder on my desk top