门户出问题了！模板文件未找到！

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昨天给DZ X2打上补丁的之后，点门户出现了下面几段文字

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6. Discuz! System Error
   
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8. Your request has encountered a problem.
   
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14. Error messages:
    
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18. 模版文件未找到或者无法访问: ./template/default/portal/index.htm
    
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22. Program messages:
    
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26. [Line: 0034]portal.php(require_once)
    
27. [Line: 0027]source/module/portal/portal_index.php(include_once)
    
28. [Line: 0004]data/template/1_diy_portal_index.tpl.php(checktplrefresh)
    
29. [Line: 0483]source/function/function_core.php(template->parse_template)
    
30. [Line: 0031]source/class/class_template.php(template->error)

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这是怎么回事？求高手帮助！