iOS Dropbox API "not currently support by MPOAuthConnection" occur after changing user

Question

I am trying to use Dropbox API on iOS but I got trapped by the error when I try to use loadMetadata method.

process flow is below..

---

1.link (UserA)

[[DBSession sharedSession] linkFromController:self];

2.allow authorization on dropbox authorization view

3.unlink (UserA)

[[DBSession sharedSession] unlinkAll];

4.link (UserB)

[[DBSession sharedSession] linkFromController:self];

5.allow authorization on dropbox authorization view

6.loadMetadata

[[self restClient] loadMetadata:path];

But here I get the error:

Terminating app due to uncaught exception 'Unsupported Signature Method', reason: 
'The signature method "(null)" is not currently support by MPOAuthConnection'

---

loadMetaData did work correctly as UserA but it did not work after changing user.

I doubt that the way to unlink could be not enough .. but I do not know.

Please give me any advices in order to solve the problem. Any help will be appreciated.

Answer 1

• Migrating the answer above to a proper one.... As @yusaku posted in a comment on his question, this link has the answer: https://forums.dropbox.com/topic.php?id=94511#post-517526

Specifically, Greg K. says:

Make sure you clear all your DBRestClient objects when you unlink. If you try to use an old DBRestClient object it will cause this problem.

Clearing the old DBRestClient should be a no-brainer, but when it's late and you're following sample code that makes it a persistent class variable, it's easy to skip a brain or two.