It looks like this isn't part of GWT itself, but an external library. 
Here's a stackoverflow post i found from a few years ago that seems to 
address your issue: 
https://stackoverflow.com/questions/31424639/gwt-error-when-uploading-file-with-singleuploader

It looks like the project might live on in github, but there has been 
minimal activity there: https://github.com/manolo/gwtupload/. Check the 
network of forks for more updated versions to see if one of them might be 
the "new home" for this project? https://github.com/manolo/gwtupload/network

On Tuesday, June 30, 2020 at 8:52:36 AM UTC-5, ahmdt wrote:
>
> 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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