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Unable to open file 'Access-Control-Allow-Origin'


Hi all!
I uploaded all WebDataRocks js and css files to my domain my-site.it.
Starting from the basic example, I specified a different data file, located in the same domain, but I got the following error message: 
Unable to open file https://my-site.it/webdatarocks/data.csv?440294287.
It seems that this file doesn’t exist or ‘Access-Control-Allow-Origin’ header is absent in the resource requested.
I also get the same message if all files are saved in my PC or only csv data file is local (see index_csv_locale.html attached).
How to solve the problem?
Thank you in advance.

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