I'm not familiar with that macro, but there's a gotcha with using the embedded Blog Posts macro in the dashboard, per issue https://jira.atlassian.com/browse/CONF-38095.
If your macro config permits specifying spaces as explicit keys or meta-values (e.g. @global, @favourite), try doing that. "Null parameter in parameters list" is a message you'd normally expect to see when trying to search content with a space query of type "@self" but the search isn't running in the context of a space so @self resolves to null.
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