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I rendered a PNG sequence with alpha channel from After Effects. When I'm trying to import it in TVPaint I get this error message and TVPaint crashes

The PNG is rendered at 8bit and uses this color profile: sRGB IE61966-2.1 (which is set by default).

Hhmm... This is an old bug.
A few years ago I shared a Photoshop script that allows you to export without the sRGB profile, thus preventing the error from happening: http://forum.tvpaint.com/viewtopic.php?f=11&t=9955

Can you try it to see if it still works?