First things First. Why are you reading this, You should never under any circumstances sell you LEGO collection. Unless your selling it to me, or you need the money. In which case, I am sad for you, and hopefully happy for me.
Error: (#10) To use ‘Groups API’, your use of this endpoint must be reviewed and approved by Facebook. To submit this ‘Groups API’ feature for review please read our documentation on reviewable features: https://developers.facebook.com/docs/apps/review. Type: OAuthException Code: 10 Please refer to our Error Message Reference.