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我一步一步跟着wamp服务器安装testink。 一切都很好，除了最后一步，当我打开链接： http://localhost/testlink-1.9.14/login.php在testlink安装过程中出现SmartyCompilerException错误
我得到这个：
Fatal error: Uncaught exception 'SmartyCompilerException' with message 'Syntax Error in template "C:\wamp\www\testlink-1.9.14\gui\templates\login.tpl" on line 23 "{if $tlCfg->demoMode}{$labels.demo_usage}{/if}" unknown tag "private_print_expression"' in C:\wamp\www\testlink-1.9.14\third_party\smarty3\libs\sysplugins\smarty_internal_templatecompilerbase.php on line 665
(!) SmartyCompilerException: Syntax Error in template "C:\wamp\www\testlink-1.9.14\gui\templates\login.tpl" on line 23 "{if $tlCfg->demoMode}{$labels.demo_usage}{/if}" unknown tag "private_print_expression" in C:\wamp\www\testlink-1.9.14\third_party\smarty3\libs\sysplugins\smarty_internal_templatecompilerbase.php on line 665
Call Stack
# Time Memory Function Location
1 0.0006 303984 {main}() ..\login.php:0
2 0.1015 8857432 renderLoginScreen() ..\login.php:75
3 0.1034 8972560 Smarty_Internal_TemplateBase->display() ..\login.php:230
4 0.1034 8976768 Smarty_Internal_TemplateBase->fetch() ..\smarty_internal_templatebase.php:374
5 0.1047 9006248 Smarty_Internal_Template->compileTemplateSource() ..\smarty_internal_templatebase.php:155
你能帮我请，谢谢