Facebook login suddenly broken

Out of the blue I am not able to log in to my Meteor website via FB. I didn’t change any code and this is the error message I’m seeing: W20170328-18:01:21.994(2) (oauth_server.js:398) Error in OAuth Server: Failed to complete OAuth handshake with Facebook. failed [400] {"err or":{"message":"Error validating client secret.","type":"OAuthException","code":1,"fbtrace_id":"GVsuukn1ig\/"}} I20170328-18:01:22.366(2)? Exception while invoking method 'login' Error: Failed to complete OAuth handshake wi...

28 Mar 2017 ... type":"OAuthException","code":1,"fbtrace_id":"GVsuukn1ig\/"}} I20170328-18:01: 22.366(2)? Exception while invoking method 'login' Error: ...

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