HTTP Error 500 after active theme's plugins

[anaet]

I am facing HTTP ERROR 500 after installing plugins that recommended by the theme. I have downloaded yesterday updated copy of theme from ThemeForest but it still errors. What is the problem with the theme? and Plugins? It mostly happen when i active visual composer, sitesao-core and rev slider plugins.

Let me now tha solutions and give me link for download updated versions of those plugins and theme.

Thank you

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