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XF 1.3 problem in upgrade

#1
Hi
I tried to upgrade my website to 1.4.2
and I cant complete I have this message:
Fatal error: Class 'XenForo_Template_Compiler_Tag_Admin_SubmitUnit' not found in /home/****/public_html/vb/library/XenForo/Template/Compiler/Admin.php on line 56


can u help me please