I just tried this out with v3.1.3 of the official Dropbox Java SDK, but that issue didn't occur for me. We'll be happy to look into this further, but we'll need some more information. Please reply with:
the name and version number of the platform you're using
the steps to reproduce the issue, including relevant code snippet(s)
the full text/stack trace of the error or unexpected output
Error in call to API function "files/create_folder:2": request body: could not decode input as JSON
com.dropbox.core.BadRequestException: Error in call to API function "files/create_folder:2": request body: could not decode input as JSON
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