Is error 99 on a Canon 5d fixable?

I'm a Nikon shooter myself but I found a cannon 5D on a website for $100.
user says it has error 99 and I was wondering if this is fixable and could I fix it? And make a quick buck off it Or use it

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Camera for photography?

Hi everyone, I was looking to buy a camera to start doing for photography. Obviously I'm just a beginner, but hopefully I could get good enough to start doing weddings or something. I don't want to go too fancy, but I was looking at a Nikon D3400 DSLR Camera 24.2MP. Can anyone tell me if this would be a good start.

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Canon 1300D (T6) or 750D (T60i) ? I have the lens from my old nikon (70-200mm usm ii f/2,8 L) which one suits my lens better

I want the best quality out of it and the 18megapixel of t6 scares me:/ should i care about the megapixel? Not?

Read more: Canon 1300D (T6) or 750D (T60i) ? I have the lens from my old nikon (70-200mm usm ii f/2,8 L) which one suits my lens better