repeated sync error on one of several computers

I use zotero on several computers. every time I open zotero (5.0.23) on one (new) computer, I get an error message, although the sync does pick up new items added on other computers (all report same number of items [6200]). report ID 508376878. two older computers, which sync without error message, are running 4.0.29.17
thanks in advance for any suggestions.
Rogers Brubaker
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