Ronald from the Google Merchant Center team posted on a new error some merchants might see. The post is at the Google Merchant Center Help forum.
The new error is named "offer too big" and can occur when your feed has an "unusually high number of characters" that are not relevant to the product in the feed. Ronald explained:
So if you get this error, you can fix it by dropping out any excess HTML or code from your feeds.
Forum discussion at Google Merchant Center Help.