Error: Invalid signature

Error: Invalid signature


If you see an error message containing the words "invalid signature" when opening a Learning Science resource it could be caused by one of the following issues:

Issue 1: An incorrect LTI URL has been used.

Fix:  Please check the LTI URL you have added for this activity, it should look exactly like the one below where xxxxx will be the unique number for  your activity.  If you are adding a LabSim, you will find a table of LTI URLs on your homepage by clicking on the link "LTI details for all resources". Make sure that you have copied the correct URL from the table and haven't obtained the URL from somewhere else. If you are adding a Smart Worksheet or LabSim Assessment, your LTI URL will have been emailed to you.

Example of a correct LTI URL: https://resources.learnsci.co.uk/enrol/lti/tool.php?id=xxxxx

Issue 2: The Shared Secret has not been entered correctly.

If the Learning Science LTI tool has been configured on your VLE/LMS
Fix: You will need to get in touch with your VLE/LMS administrator who can check that the Shared Secret has been set up correctly. 

If the Learning Science LTI tool has not been configured on your VLE/LMS
Fix: You will need to edit the settings on the Learning Science resource that is causing the error message and check that the Shared Secret has been entered correctly.

If you need further help, please let our support team know by using the "Submit a ticket" form at the bottom of this page or contact support@learnsci.com


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