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Unable to load the requested class: low_variables_settings

Emily Raymond 7 Feb 2019 20:15 question, complete

Hello,

I just upgraded EE from 2.6 to 3.5 to 5.1.12. I am getting an error that says:

Unable to load the requested class: low_variables_settings

It appears that when the libraries array is loaded at system/user/addons/low_variables/base.low_variables.php:

ee()->load->library($this->libraries);

The Loader.php at system/ee/legacy/core/Loader.php cannot find the correct path to the file.

Anyone face this issue before?

Replies

1. Emily Raymond 7 Feb 2019 21:05

   More details:
   
   _ci_load_class() in system/ee/legacy/core/Loader.php is being called five times for each of the low_variables library.
   
   The first call to _ci_load_class() exits normally at:
   return $this->_ci_init_class()
   
   The second and third call to _ci_load_class() exit as duplicates at:
   $is_duplicate = TRUE;
   log_message('debug', $class." class already loaded. Second attempt ignored.");
   return;
   
   The fourth call to _ci_load_class() causes the issue. The correct path is no longer in $this->_ci_library_paths so the following code is run:
   
   if ($subdir == '')
   {
   $path = strtolower($class).'/'.$class;
   return $this->_ci_load_class($path, $params);
   }
   
   Because of that, _ci_load_class() runs for the fifth time with the
   $class='low_variables_settings/low_variables_settings'
   
   This last call if actually what causing the error message:
   Unable to load the requested class: low_variables_settings
   
   I created a temporary fix for all the low_variables libraries in my Loader.php function; however, I am not sure what the root cause of the issue is.
   
   Any ideas?

2. Low 8 Feb 2019 12:39

   Hmm, path issues like these are intermittent and a pain to debug...
   
   What version of LV are you running?

3. Emily Raymond 8 Feb 2019 17:27

   Thanks for the quick reply. I am really stuck on this issue.
   
   I am using 3.2.0 LV.

4. Low 8 Feb 2019 17:56

   As I cannot replicate this myself, can you try the following...
   
   Open up base.low_variables.php and look up line 117 - 119, which read:
   
   

   ee()->load->helper($this->package); 
    ee()->load->library($this->libraries); 
    ee()->load->model($this->models);

   
   
   ...change that to:
   
   

   ee()->load->add_package_path(PATH_THIRD.$this->package); 
    ee()->load->helper($this->package); 
    ee()->load->library($this->libraries); 
    ee()->load->model($this->models); 
    ee()->load->remove_package_path(PATH_THIRD.$this->package);

   
   
   ...and see if that resolves the issue.

5. Emily Raymond 11 Feb 2019 21:51

   Thank you so much for your help! This change fixed the issue I was having. I really appreciate your quick replies!