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2016-01-26 15:49:04 +0200 answered a question Sage Notebook is not working

I get the same error (I tried 1 + 1). It seems that everything is undefined, also objects like Matrix. If you type somewhere Integer = int. Then sage will get 1+1 and output 2, but then if you try to make an object like a Matrix, it will still say that Matrix is not defined.