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I have question, do you enable the display_error in php ini configuration? because when I debug it by enable_reporting to development on Joomla config, there is no error show in your page. hard for us to inspect if the display error is not showing at all.
Well, I already installed ijoomla installer on your Joomla backend, please you provide the lincense number on that page, so we can install Jomsocial easily from there.