Hi, I was using the example PhotoPostExample using OAuth on iOS. The user is successfully authenticated but I am not able to upload the test image. Here is the error message:

Error posting to Tumblr, Error Domain=TMTumblrSDKErrorDomain Code=1 "Request failed." UserInfo={TMTumblrSDKHTTPStatusCodeErrorKey=404, NSLocalizedDescription=Request failed.}

How can I find out the cause of this error? Thanks!