I'm new to blender, and I have a problem with rigging. I follow the tutorial to add armatures to the model, but after that, when I press ctrl+p and choose "with automatic weight" it gives me an error says "heat weighting: failed to find solution for one or more bones" I tried all the solutions that I found on the internet like remove double, delete or apply all the modifier, delete all the vertex groups, check the transform, rotation and scale(they are all good)
But nothing helps. I don't know if there's any problem with my mesh...

here is my blender file
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Gensyuuu
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Possible duplicate of heat weighting: failed to find solution for one or more bones – Duarte Farrajota Ramos Jul 19 '18 at 23:48
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@DuarteFarrajotaRamos I checked that answer before, and tried both of those solutions, but they can't solve my problem – Gensyuuu Jul 20 '18 at 00:08
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I have found 3 non manifold vertices, but removing them didn't help. May be automatic weighting isn't design for high vertex counts. I noticed, that if only succeeds even in lower vertex count, when removing intersection faces. – Leander Jul 20 '18 at 08:09