切换成3.0的是没有 问题的。

/Applications/XAMPP/xamppfiles/htdocs/Guocui/Admin/Lib/Model/UserModel.class.php 第 2 行.
错误位置
FILE: /Applications/XAMPP/xamppfiles/htdocs/Guocui/_core/Lib/Core/Think.class.php 　LINE: 275
TRACE
[13-01-12 22:35:01] /Applications/XAMPP/xamppfiles/htdocs/Guocui/_core/Lib/Core/Think.class.php (275) halt(Class 'RelationModel' not found /Applications/XAMPP/xamppfiles/htdocs/Guocui/Admin/Lib/Model/UserModel.class.php 第 2 行.)
[13-01-12 22:35:01] /Applications/XAMPP/xamppfiles/htdocs/Guocui/_core/Lib/Core/Think.class.php (290) Think::appError(1, Class 'RelationModel' not found, /Applications/XAMPP/xamppfiles/htdocs/Guocui/Admin/Lib/Model/UserModel.class.php, 2)
[13-01-12 22:35:01] () Think::fatalError()
ThinkPHP3.1.2 { Fast & Simple OOP PHP framework } -- [ WE CAN DO IT JUST THINK ]