Hi mypolaris0227, it's possible for the Dropbox API to return an unexpected 500 like this at times, but when that does happen, it usually just a transient issue on our side, so you should have your app catch these exceptions and retry a few times.
If you are seeing this consistently though, please open a new thread with some more specific information, that is, the version of the SDK/library you're using, and the code to reproduce the issue, and we'll be happy to look into it for you:
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