我一直在处理克隆升级，我想我几乎完成了清理工作。
这个最新的错误让我...
在 main_template 我得到一个错误：
Macro Expansion failed
exceptions.NameError: name 'pathexpr' is not defined
我将其追溯到来自 portlets_fetcher 模板。这个是开箱即用的，但它仍然抛出错误。
没看懂，直接看：
tal:define="pathexpr python:slot[0];
usemacro python:slot[1];"
有人知道我为什么会得到这个吗？
我的故障排除，我在尝试编辑自定义 main_template 时遇到错误。我在任何地方都没有看到 pathexpr，所以我使用了 skins 文件夹中的 find 选项卡，唯一的结果是 portlets_fetcher。我将 portlets_fetcher 复制到 custom 并在那里看到了同样的错误。
编辑：这是 portlets_fetcher 模板：
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
xmlns:tal="http://xml.zope.org/namespaces/tal"
xmlns:metal="http://xml.zope.org/namespaces/metal"
xmlns:i18n="http://xml.zope.org/namespaces/i18n"
i18n:domain="plone">
<body>
<metal:leftcolumn define-macro="left_column"
tal:define="Iterator python:modules['Products.CMFPlone'].IndexIterator;
tabindex python:Iterator(pos=10000, mainSlot=False);"0
tal:condition="sl|nothing">
<metal:block tal:repeat="slot sl">
<tal:dontcrash tal:on-error="structure python:context.plone_log('Error %s on %s while rendering portlet %s'%(error.type, error.value, slot[0])) or
'<div class=\'error\'>Error %s on %s: %s</div>' % (error.type, slot[0], error.value)"
tal:define="pathexpr python:slot[0];
usemacro python:slot[1];">
<tal:block tal:condition="usemacro">
<metal:block metal:use-macro="python:path(pathexpr)" />
</tal:block>
<span tal:condition="not: usemacro"
tal:replace="structure python:path(pathexpr)" />
</tal:dontcrash>
</metal:block>
</metal:leftcolumn>
<metal:rightcolumn define-macro="right_column"
tal:define="Iterator python:modules['Products.CMFPlone'].IndexIterator;
tabindex python:Iterator(pos=20000, mainSlot=False);"
tal:condition="sr">
<metal:block tal:repeat="slot sr">
<tal:dontcrash tal:define="pathexpr python:slot[0];
usemacro python:slot[1];">
<tal:block tal:condition="usemacro">
<metal:block metal:use-macro="python:path(pathexpr)" />
</tal:block>
<span tal:condition="not: usemacro"
tal:replace="structure python:path(pathexpr)" />
</tal:dontcrash>
</metal:block>
</metal:rightcolumn>
</body>
</html>
这是main_template：
<metal:page define-macro="master"><metal:doctype define-slot="doctype"><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"></metal:doctype>
<metal:block define-slot="top_slot" />
<metal:block use-macro="here/global_defines/macros/defines" />
<html xmlns="http://www.w3.org/1999/xhtml"
xml:lang="en"
lang="en"
tal:attributes="lang language;
xml:lang language">
<tal:cache tal:define="lang language;
charset site_properties/default_charset|string:utf-8">
<metal:cache use-macro="here/global_cache_settings/macros/cacheheaders">
Get the global cache headers located in global_cache_settings.
</metal:cache>
</tal:cache>
<head metal:use-macro="here/header/macros/html_header">
<metal:fillbase fill-slot="base">
<metal:baseslot define-slot="base">
<base href="" tal:attributes="href here/renderBase" />
</metal:baseslot>
</metal:fillbase>
<metal:headslot fill-slot="head_slot">
<metal:headslot define-slot="head_slot" />
<tal:comment replace="nothing"> A slot where you can insert elements in the header from a template </tal:comment>
</metal:headslot>
<metal:styleslot fill-slot="style_slot">
<tal:comment replace="nothing"> A slot where you can insert CSS in the header from a template </tal:comment>
<metal:styleslot define-slot="style_slot" />
</metal:styleslot>
<metal:cssslot fill-slot="css_slot">
<tal:comment replace="nothing"> This is deprecated, please use style_slot instead. </tal:comment>
<metal:cssslot define-slot="css_slot" />
</metal:cssslot>
<metal:javascriptslot fill-slot="javascript_head_slot">
<tal:comment replace="nothing"> A slot where you can insert javascript in the header from a template </tal:comment>
<metal:javascriptslot define-slot="javascript_head_slot" />
</metal:javascriptslot>
</head>
<body tal:attributes="class here/getSectionFromURL;
dir python:test(isRTL, 'rtl', 'ltr')">
<div id="visual-portal-wrapper">
<div id="portal-top" i18n:domain="plone">
<div id="portal-header">
<p class="hiddenStructure">
<a accesskey="2"
tal:attributes="href string:${current_page_url}#documentContent"
i18n:translate="label_skiptocontent">Skip to content.</a> |
<a accesskey="6"
tal:attributes="href string:${current_page_url}#portlet-navigation-tree"
i18n:translate="label_skiptonavigation">Skip to navigation</a>
</p>
<div metal:use-macro="here/global_siteactions/macros/site_actions">
Site-wide actions (Contact, Sitemap, Help, Style Switcher etc)
</div>
<!--div metal:use-macro="here/global_searchbox/macros/quick_search">
The quicksearch box, normally placed at the top right
</div-->
<a metal:use-macro="here/global_logo/macros/portal_logo">
The portal logo, linked to the portal root
</a>
<!--div metal:use-macro="here/global_skinswitcher/macros/skin_tabs">
The skin switcher tabs. Based on which role you have, you
get a selection of skins that you can switch between.
</div-->
<div metal:use-macro="here/global_sections/macros/portal_tabs">
The global sections tabs. (Welcome, News etc)
</div>
</div>
<div metal:use-macro="here/global_personalbar/macros/personal_bar">
The personal bar. (log in, logout etc...)
</div>
<!--div metal:use-macro="here/global_pathbar/macros/path_bar">
The breadcrumb navigation ("you are here")
</div-->
</div>
<!--div class="visualClear" id="clear-space-before-wrapper-table" /-->
<tal:comment replace="nothing">
The wrapper table. It contains the three columns. There's a table-less
alternative in the plone_tableless skin layer that you can use if you
prefer layouts that don't use tables.
</tal:comment>
<table id="portal-columns">
<tbody>
<tr>
<tal:comment replace="nothing"> Start of the left column </tal:comment>
<td id="portal-column-one"
metal:define-slot="column_one_slot"
tal:condition="sl">
<div class="visualPadding">
<metal:portlets define-slot="portlets_one_slot">
<metal:leftportlets use-macro="here/portlets_fetcher/macros/left_column">
This instruction gets the portlets (boxes) for the left column.
</metal:leftportlets>
</metal:portlets>
</div>
</td>
<tal:comment replace="nothing"> End of the left column </tal:comment>
<tal:comment replace="nothing"> Start of main content block </tal:comment>
<td id="portal-column-content"
tal:define="tabindex python:Iterator(pos=0, mainSlot=True)">
<metal:block define-slot="content">
<div id="content"
metal:define-macro="content"
tal:define="show_border python:here.showEditableBorder(template_id=template_id, actions=actions );"
tal:attributes="class python:test(show_border,'documentEditable','')">
<metal:ifborder tal:condition="show_border" >
<tal:block tal:condition="not:here/isAnonymousUser">
<div metal:use-macro="here/global_contentviews/macros/content_views">
The content views (View, Edit, Properties, Workflow)
</div>
<div metal:use-macro="here/global_contentviews/macros/content_actions">
The content bar
</div>
</tal:block>
</metal:ifborder>
<div class="documentContent" id="region-content">
<a name="documentContent"></a>
<div metal:use-macro="here/global_statusmessage/macros/portal_message">
Portal status message
</div>
<metal:bodytext metal:define-slot="main" tal:content="nothing">
Page body text
</metal:bodytext>
<metal:sub metal:define-slot="sub">
<metal:discussion use-macro="here/viewThreadsAtBottom/macros/discussionView" />
</metal:sub>
</div>
</div>
</metal:block>
</td>
<tal:comment replace="nothing"> End of main content block </tal:comment>
<tal:comment replace="nothing"> Start of right column </tal:comment>
<td id="portal-column-two"
metal:define-slot="column_two_slot"
tal:condition="sr">
<div class="visualPadding">
<metal:portlets define-slot="portlets_two_slot">
<metal:rightportlets use-macro="here/portlets_fetcher/macros/right_column">
This instruction gets the portlets (boxes) for the right column.
</metal:rightportlets>
</metal:portlets>
</div>
</td>
<tal:comment replace="nothing"> End of the right column </tal:comment>
</tr>
</tbody>
</table>
<tal:comment replace="nothing"> end column wrapper </tal:comment>
<div class="visualClear" id="clear-space-before-footer"><!-- --></div>
<hr class="netscape4" />
<metal:block i18n:domain="plone">
<metal:footer use-macro="here/footer/macros/portal_footer">
Footer
</metal:footer>
<metal:colophon use-macro="here/colophon/macros/colophon">
The colophon area - contains details about the production of
the site. Typically "powered by" buttons, standards, tools used.
</metal:colophon>
</metal:block>
</div>
</body>
</html>
</metal:page>