GWT SingleUploader gets stuck

When I upload a file using SingleUploader or MultiUploader, the file gets uploaded but the uploader's progress bar gets stuck at 0% for a very, very long time.

When I try to upload a second file in the same session, I get this message:

 

There is already an active upload, try later.

This is my code:

final SingleUploader uploader = new SingleUploader();

uploader.setAutoSubmit(false);

uploader.setMultipleSelection(false);

uploader.setValidExtensions(".log");

uploader.setServletPath("/reprocess/"+userTestXml);

uploader.avoidRepeatFiles(false);

 Any advice here?

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