This error only happens when navigating from the Create Question/Edit Question screen of samigo.
To reproduce the issue:
1. Enter as instructor
2. Go to Test & Quizzes
3. Go to Question Pool
4. Create a Question Pool
5. Create a Subpool inside the first question pool
6. Go to assesments
7. Create an assesment
8. Create a new question
9. Click on the "Question Pool" tab
10. When navigating to the "Question Pool" screen, if you check the Web console you´ll see an 404 error. The folder icon is not displayed.