It's possible it could be related to specific shipping options you've chosen. I haven't run into your particular error, however, I've only tried to get GCO to work with USPS shipping. So, I guess my next suggestion would be to experiment by removing all the other shipping methods except for Flat Rate (or some shipping method not MZMT) and see if your foreach error goes away. If you haven't done so already, try searching the forum for "foreach", I believe someone else mentioned a foreach error a while back.
I'm kind of swinging in the dark here, so perhaps someone more knowledgeable or someone who has run into this error before can chime in.
Good luck,
Shawn
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