After Effects warning: An invalid track index

Hello, I am running CC 2014 on Windows 7.
I have a project with a significant amount of basic animation (just 2D scale and position keyframing), and while working on adding sound effects, I keep getting this error when I try to RAM preview: "After Effects: BE: An invalid track index has been added to the sequence."
If I hit ok, the preview plays, but with no audio.
Any ideas what to do? I've tried clicking tracks on and off, and it does help, but very inconsistantly to where I can't pin point the source of the problem. There's one track that when turned on, I do NOT get the error, and when turned off, or deleted, I DO get the error. This just baffles me.
Thanks for any help-- I'm on a tight deadline and really need to work through this ASAP.

You have two, and perhaps three, problems going on:
1) Don't use mp3 audio in AE.  Just don't.  It has NEVER worked properly, and problems rear their ugly heads only intermittently... like when you time-remap it.  Convert mp3's to lossless audio files like wav or aiff.
2) Don't Time Remap audio and expect it to work properly when you render.  It's better to export out the time-remapped audio as a wav or aiff, reimport and use the new audio clip when rendering.  Or just export it and use it in a video editing application along with your animations from AE.
3) FORTY-NINE layers of audio?  That's crazy in AE!  AE stinks at audio!  It's Hell On Earth to mix all those tracks in AE!
I bet you can find a different application to put all those tracks together with the video.  I bet you can figure out an alternate workflow.  And you should.  The best way to use audio in AE is as a reference for timing your animations.  I use that strategy when I'm working on my stuff, and when I render, I don't render an audio track... not even when it's lip-sync audio!  I match up everything in a video editing application, and I have never, EVER had a problem.  Not once.  You can find a different application for that audio work -- now go find it.

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