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Getting "Invalid appsecret_proof provided in the API argument" when trying to log on with FB

When trying to log on with FB, i get this:

Error code: 8010
Error message: “Invalid appsecret_proof provided in the API argument”

I use the same code as previously, but now I get this error. There is no problem with the FB login itself, it’s just when I call backendless. I read this thread:

but I do not understand how this became an issue with backendless now when my code has worked this far. What is an appsecret and what does it mean that it is invalid?

Hi, @exodeveloper!

Facebook’s appsecret is used to decode encrypted messages from Facebook. If you only intend to get it, please reproduce the steps in guide .

appsecret_proof is generated based on the appsecret and Facebook app id, so make sure you use this pair that was generated by corresponding Facebook developer’s app.

Ok, thanks!