Where is the error?

Algebra Level 2

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

  1. 1=i2-1 = i^{2}
  2. 1=i×i-1=i \times i
  3. 1=1×1-1 = \sqrt{-1} \times \sqrt{-1}
  4. 1=1×1-1 =\sqrt{-1 \times -1}
  5. 1=1-1 =\sqrt{1}
  6. 1=1. -1=1.

In which step does the error exist?

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