I ran into this problem. It turned out that I did not have a working directory pointing to my brilliant application when I used shiny.io to save and deploy my application.
Make sure that if you download data that reflects the code, then your brilliant application is the working directory.
Otherwise, you get a log error that looks something like this:
cannot open the compressed file "C: /Users/Joseph/Documents/data/data.rda", the probable cause is "There is no such file or directory"
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