Views, Display Suite - fatal error on allowed memory size - what could be happening? I am setting up my guitar lessons site which has categories via taxonomy and then lesson and exercise content types. Exercises are in a lesson, via entity reference. I am using Views and Display Suite. When I try to add a taxonomy view so I can list the lessons (along with the exercises therein), I get this:

Fatal error: Allowed memory size of 94371840 bytes exhausted (tried to allocate 64 bytes) in /home/user/dev.example.com/sites/all/modules/views/includes/base.inc on line 93

Here is what I did:

I created a view (content pane) for taxonomy terms of type lesson category. The goal is to have a display such as

Lesson 1
Lesson 1 Description
    Exercise 1 in Lesson
    Exercise 1 Description
Lesson 2
...


The view filters on taxonomy vocab (term Lessons), there is contextual filter on taxonomy id, and relationship Taxonomy term: Content using Category. I posted screen shot. 

I chose view mode lessons_in_category.

Then I wasn't sure what to do in Display Suite. I went to taxonomy (Lesson) content manage display, and for the lessons_in_category view mode I put the lessons in category view in the content. Screen shot attached.

I keep getting the memory error. And seems to me it shouldn't actually be a memory problem. For instance, when I click on a category, it is not like that one category has so much content to generate a memory error. So I have a feeling there is some sort of infinite loop being generated somehow between views and display suite.

Ideas?
The PHP memory limit is being exceeded. In your drupal site, go to /admin/reports/status/php and look for "Loaded Configuration File". It should be one of the first 5 columns in the table.  In a plain text editor, or a code editor, open the file listed there. In it, search for memory_limit and replace the value next to it with, say, `128M'. Save that file and restart your web server. You may need to increase the memory limit again, if your server still errors out.