Troubleshooting Error Messages in the LMS App

• Something went wrong: Unable to fetch grade
• Hypothesis couldn’t find the file in the course (Canvas)
• Hypothesis couldn’t find the file in the course (Blackboard)
• Couldn’t get the file from Canvas
• Authorization failed – Something went wrong when authorizing Hypothesis
• invalid_client

Something went wrong: Unable to fetch grade

Additional details in the error message may include:

• LTI outcome request failed
• Missing or invalid consumer key or access token

This error can occur if the LMS is running on an Apache HTTP Server that has not been configured to allow access to HTTP authorization headers.

Ask your LMS hosting provider or systems administrator to set the following Apache directive:

CGIPassAuth On

Further information about this directive can be found here: https://httpd.apache.org/docs/trunk/mod/core.html#cgipassauth

Hypothesis couldn’t find the file in the course (Canvas)

Please visit Fixing a Broken Canvas File Link.

Hypothesis couldn’t find the file in the course (Blackboard)

The Hypothesis error: “Hypothesis couldn’t find the file in the course” indicates that either:

1. The original file is missing: You will need to upload a new PDF to the course content folder and then create a new Hypothesis assignment.
2. The file does not have the appropriate permissions set for student access: Please follow the instructions for creating a folder and setting permissions before uploading the PDF and creating the Hypothesis assignment again.

Couldn’t get the file from Canvas

Please visit Fixing a Broken Canvas File Link.

Authorization failed – Something went wrong when authorizing Hypothesis

The error details state: “Client does not have access to specified Canvas account”.

This error is shown when the Canvas Developer Key associated with Hypothesis has been turned off. Please contact your Canvas administrator to have the key turned back on.

invalid_client

The full text of this error is: {“error”:”invalid_client”,”error_description”:”unknown client”}

This is an error displayed by Canvas when the Developer Key associated with a Hypothesis instance has been deleted. To resolve, a new Canvas Developer Key will need to be created, and Hypothesis will need to be reinstalled with new credentials associated with the new Developer Key.