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I've been having issues with Parsoid and VisualEditor recently, getting this error everytime I try to edit the page:

Error loading data from server: Server error.

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The solution was to edit my config to setup appropriately. In the Parsoid localSettings.js, the first value should be an identified for a wiki, and the second a URL to the api.php service.

parsoidConfig.setInterwiki( 'localhost', '' );

Secondly, I had to change $wgVisualEditorParsoidURL in LocalSettings.php to reflect this:

$wgVisualEditorParsoidURL = '';
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