Logging into your GLPI installation from Gapp (A GLPI app) is not possible due to this error message:

missing parameter app_token; view documentation in your browser at http://yourglpi/apirest.php/#ERROR_APP_TOKEN_PARAMETERS_MISSING


As for GLPI API Errors reference:

The current API requires an App-Token header for using its methods.

An App_Token has been generated for a particular API Client, and it has not been implemented in Gapp.


Removing  Application token (App_Token) will fix the error.

Removing GLPI App token

Don’t forget to save!


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