Fatal error: Uncaught Error: Class 'Smarty_Internal_Compile_Assign' not found in C:\Project\WWW\SanGuo130\ThinkPHP\Library\Vendor\Smarty\sysplugins\smarty_internal_compile_append.php:18 Stack trace: #0 {main} thrown in C:\Project\WWW\SanGuo130\ThinkPHP\Library\Vendor\Smarty\sysplugins\smarty_internal_compile_append.php on line 18