Why is my mesh fully black after baking ?

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Question
Why is my mesh fully black in the viewport after I just finished baking in Substance Painter ?
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Explanation
The viewport being fully black after baking is because one of the baked textures is fully black as well. If the Ambient Occlusion texture is black it will darken all the lighting in the viewport for example.
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Solution : Substance Painter
There are two possible solutions :
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