I've downloaded uGet with aria2 and everything works fine when I only download from one server. When I activate Aria plugin to download from more than one server connections a get this messages and the download never start.
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It looks like you are downloading the same file multiple times...uGet will not do that...it will recognize that you already have it and immediately say it is done because you already have it.
You need to test this on a new file or delete the existing file to see it working.
Now that I've revisited this issue it looks as though you don't actually have aria2 installed. For more information about the aria2 plugin please go to http://ugetdm.com/downloads-aria2