Error message

Hi, could you tell us what is the version of WordPress ?

Hi, if you still have this issue, here is more information.

The error message “Couldn’t load tree: undefined” is raised when the Ajax request which aims to build the page tree fails.

Several reasons for that :

1. The Ajax request takes longer than the defined maximum execution time allowed for a PHP script. (Having 700 pages shouldn’t be a problem but the first tree building may take too much time.)
2. The Ajax request response is corrupted by something else. (We had this problem with some cache plugins inserting text into every Ajax responses. Do you have a cache enabled (event the WP_CACHE in wp-config) ?)

A good way to debug :

1. Open the browser console (eg. Ctrl+Shift+i in Chrome)
2. Open the Network Tab
3. Open the WordPress which doesn’t work
4. Search for [your site]?apm_sb_ajax_page=ajax-processor call
5. Open Response tab
6. Post here the Response tab content

Please note that if the [your site]?apm_sb_ajax_page=ajax-processor never ends, then you have the max excecution time problem.

Let us know !

I followed the instructions and when I clicked on the Response tab it showed the existing index.htm page. (We are building the site in the background before deleting index.htm) I thought this might be causing the problem so I deleted index.htm and then the plugin worked fine. So thank you!

Nice to hear ??

I am having the same problem. I found this thread and followed these instructions and it worked. However, I needed to put my old index.html page back for a while whilst I made some adjustments.

I repeated the process when I was ready to swap back again….moved the old index.html and renamed my index.php (it was a copy) but now I’m getting a different message in the Response tab:

<b>Warning</b>: require(./wordpress/wp-blog-header.php) [function.require]: failed to open stream: No such file or directory in <b>/home/content/43/10338043/html/index.php</b> on line <b>17</b>

<b>Fatal error</b>: require() [function.require]: Failed opening required ‘./wordpress/wp-blog-header.php’ (include_path=’.:/usr/local/php5_3/lib/php’) in <b>/home/content/43/10338043/html/index.php</b> on line <b>17</b>

Any ideas?

Oops – just noticed that this says resolved so I will create another post.

Checked.