If you are using the `WWW` class to access a website you do not own, then the alien website needs to have a `crossdomain.xml` file which gives you access. If this file does not exist, or the file says you cannot have access, then you are not allowed to access the site.
The error message you present says that there is no crossdomain policy file found, so the website web server is not allowing you to have access.
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