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raju p 4raju p 4 

https://ap5.salesforce.com/setup/secur/RemoteAccessErrorPage.apexp?error=invalid_grant&error_description=expired+authorization+code

https://ap5.salesforce.com/setup/secur/RemoteAccessErrorPage.apexp?error=invalid_grant&error_description=expired+authorization+code

We can't authorize you because of an OAuth error. For more information, contact your Salesforce administrator.
OAUTH_APPROVAL_ERROR_GENERIC : An unexpected error has occured during authentication. Please try again.
i am not geting what is this when trying to login lighting trailhead i am geting this error