I am performing the following steps to prove \(-1 = 1:\)

- \(-1 = i^{2}\)
- \(-1=i \times i\)
- \(-1 = \sqrt{-1} \times \sqrt{-1}\)
- \(-1 =\sqrt{-1 \times -1}\)
- \(-1 =\sqrt{1}\)
- \( -1=1.\)

In which step does the error exist?

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