No rich snippet will be generated…

Hi, since the change to “article” as schema there is following message desplaxes in Google Rich Snippet Tool:

hreview-aggregate (…)
No rich snippet will be generated for this data, because it appears to include multiple aggregate reviews of many items, instead of a single aggregate review of one item.

All the rich snippets are missing now. What could I do? Thanks so much for your effort. Greetings from Germany.

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