I have the same issue. Postformat like this:
%IMG%
%TITLE%
%EXCERPT%
(%URL%)
Test post submitted successfully.
When trying to post to Facebook manually from post admin area, error message as described:
“Array ( [Warning] => [Error] => Invalid parameter )”
EDIT: resolved. The post author was not allowed to make Facebook posts. Even the logged administrator was not able to post. Once the post author was “promoted”, Facebook post was successful.
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This reply was modified 7 years, 3 months ago by viktora.