My template disappeared when I use feeds in html/java script widgets?

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Posted: 10/11/2015
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Hello I am facing problem in my theme, I usually build my basic themes using artisteer and then redesign it, I face many problems in artisteer but this problem is really weird since it only happen in artisteer themes, I usually write javascript widgets which all depends on the feeds and add them using blogger add widget tools but when I do this and open my blog I only get the widget result on blank page.

For example if I want to add recent post javascript code, I go to add javascript/html code. when I refresh the blog to see the result , all my blog disappeared and only have the javascript code result.

This happens in every javascript code that I use feeds in it.