提示找不到插件，这是怎么一回事呢？

Fatal error:  Uncaught  --> Smarty Compiler: Syntax error in template "D:\Software0721\xampp\htdocs\workspace\smt\templates\index.html"  on line 8 "<!--{test width=150 height=200}-->" unknown tag "test" <--  thrown in D:\Software0721\xampp\htdocs\workspace\smt\libs\ORG\smarty\sysplugins\smarty_internal_templatecompilerbase.php on line 8