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XF 1.5 Error

#1
I meet this error and I can't create any thread. The box can't be clicked in

Code:
Illegal string offset 'attachment_id' in E:\xampp\htdocs\test\library\XenForo\Template\Abstract.php(265) : eval()'d code, line 504:
503:     class="AttachedFile ' . (($__compilerVar14 and $__compilerVar14['thumbnailUrl']) ? ('AttachedImage') : ('')) . ' secondaryContent"
504:     id="#attachment-' . htmlspecialchars($__compilerVar14['attachment_id'], ENT_QUOTES, 'UTF-8') . '">
505:
error.png Untitled.png

-------------- UPDATE ---------------
The Redactor Toolbar response nothing when I clicked in :(