Title: Error message
Last modified: August 20, 2016
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# Error message
* Resolved [traceyweb](https://wordpress.org/support/users/artisanweb/)
* (@artisanweb)
* [13 years, 4 months ago](https://wordpress.org/support/topic/error-message-163/)
* I’ve installed the plugin and when clicking on Pages get an error which is “Couldn’t
load tree: undefined” and then it shows the page with a working symbol but nothing
happens.
* I’ve used this on another site without any problems. This website is over 700
pages – maybe that’s the reason?
* I tried installing by uploading the zip file as well as automatically through
the search plugin option. Have also tried deactivating all other plugins to see
if that helps but still same error.
* When I do anything with the Settings tab I just get a blank page. Any ideas?
* [http://wordpress.org/extend/plugins/advanced-page-manager/](http://wordpress.org/extend/plugins/advanced-page-manager/)
Viewing 7 replies - 1 through 7 (of 7 total)
* [Uncategorized Creations](https://wordpress.org/support/users/uncategorized-creations/)
* (@uncategorized-creations)
* [13 years, 4 months ago](https://wordpress.org/support/topic/error-message-163/#post-3449060)
* Hi, could you tell us what is the version of WordPress ?
* [Uncategorized Creations](https://wordpress.org/support/users/uncategorized-creations/)
* (@uncategorized-creations)
* [13 years, 4 months ago](https://wordpress.org/support/topic/error-message-163/#post-3449085)
* 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 !
* Thread Starter [traceyweb](https://wordpress.org/support/users/artisanweb/)
* (@artisanweb)
* [13 years, 4 months ago](https://wordpress.org/support/topic/error-message-163/#post-3449110)
* 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!
* [Uncategorized Creations](https://wordpress.org/support/users/uncategorized-creations/)
* (@uncategorized-creations)
* [13 years, 4 months ago](https://wordpress.org/support/topic/error-message-163/#post-3449111)
* Nice to hear 🙂
* [noodledoodle](https://wordpress.org/support/users/noodledoodle/)
* (@noodledoodle)
* [13 years, 2 months ago](https://wordpress.org/support/topic/error-message-163/#post-3449206)
* 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:
* Warning: require(./wordpress/wp-blog-header.php) [[function.require](https://wordpress.org/support/topic/error-message-163/function.require?output_format=md)]:
failed to open stream: No such file or directory in /home/content/43/10338043/
html/index.php on line 17
* Fatal error: require() [[function.require](https://wordpress.org/support/topic/error-message-163/function.require?output_format=md)]:
Failed opening required ‘./wordpress/wp-blog-header.php’ (include_path=’.:/usr/
local/php5_3/lib/php’) in /home/content/43/10338043/html/index.php on
line 17
* Any ideas?
* [noodledoodle](https://wordpress.org/support/users/noodledoodle/)
* (@noodledoodle)
* [13 years, 2 months ago](https://wordpress.org/support/topic/error-message-163/#post-3449207)
* Oops – just noticed that this says resolved so I will create another post.
* [Uncategorized Creations](https://wordpress.org/support/users/uncategorized-creations/)
* (@uncategorized-creations)
* [13 years, 1 month ago](https://wordpress.org/support/topic/error-message-163/#post-3449214)
* Checked.
Viewing 7 replies - 1 through 7 (of 7 total)
The topic ‘Error message’ is closed to new replies.
* 
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* 7 replies
* 3 participants
* Last reply from: [Uncategorized Creations](https://wordpress.org/support/users/uncategorized-creations/)
* Last activity: [13 years, 1 month ago](https://wordpress.org/support/topic/error-message-163/#post-3449214)
* Status: resolved