Amending is the right answer - omitting the homestead was an error (based upon the facts you recite) but it should be correctable. What is unclear is the affect of amending will be on your personal property - not claiming a homestead exemption can provide you significant benefits in terms of a "wild card" exemption of $4k per debtor (if you are married and filing jointly that could be two wild cards) so be sure what the net affect is. Candidly, it may be that a conversion to a Chapter 13 may be in your future depending upon your situation.
And make sure the error made was just that and you are working with competent counsel. Correctable human error is one thing. Someone not so familiar with the issues you are now facing is quite another.
Is there a question lurking here? The attorney is correct in filing an amendment.
Posting questions anonymously and receiving general answers do not substitute for consulting with an attorney licensed to practice in the jurisdiction in which you live. Answers posted here by Kevin C Gleason are only intended for general education of the public on legal matters. Please consult a qualified professional before deciding what to do about your situation.