Thread:Project:Support desk/Installing extension on 1.19.1/reply (4)

The first problem is this error:

Failed opening required '.../mediawiki/extensions/FCKeditor/fckeditor/fckeditor.php' (include_path='...') in .../mediawiki/includes/AutoLoader.php on line 1007

Make sure that the file .../mediawiki/extensions/FCKeditor/fckeditor/fckeditor.php is in place.

It seems like you have installed incompatible versions of the extensions. See Bawolff's post.