Need help with Elastic Audio in PT 7.4, Please help!!

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Hey everyone, I am a new member of the forum, I was directed here by the amateur engineer who is working on my bands recording. I wanted to use elastic audio to do some tempo tweaking on some of the tracks we are working on. It seems quite easy to use for this purpose, and I was able to find a number of videos and tutorials about doing just that. However when we attempted to activate the plugin, we got an error that said something to the effect of:

"cannot complete your request because the regions to not seem to match in length, file size or duration for multitrack proccessing" bla bla...

We consolidated all regions and trimmed them to length, what are we missing?? I have searched and can't seem to find any information on how to prepare a region or session for use with the plugin, nor any info on the cause of the error.

Thanks for any insight!