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TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class Doku_Renderer_metadata does not have a method "colspan"

TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class Doku_Renderer_metadata does not have a method "colspan"

An unforeseen error has occured. This is most likely a bug somewhere. It might be a problem in the backlinks plugin.

/var/www/wiki/inc/parserutils.php:535