Question: How to fix: 'Error, (in int) integration range' ??

Hi, 

I keep getting this error when trying to solve the following integration problem:

int(int(y, 0 <= y, x^2+y^2+z^2 <= 1));

Error, (in int) integration range or variable must be specified in the second argument, got 0 <= y

I've tried re-writting the range, but same error:

int(int(y, y = 0, x^2+y^2+z^2 = 1));

Error, (in int) integration range or variable must be specified in the second argument, got y = 0

Please help! :)

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