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    I am using HelloWear theme on Magento I have no problems with the theme (I like it a lot), but having problems installing 3rd party extensions. Every time I am trying installing an extension, it breaks the admin site. I am getting an error like

    Fatal error: Class "XXX_YYY_Helper_Data' not found.

    I created test site that has the same functionality but does not use the HelloWear theme. I can install any extension on this site with no problems.

    Can someone suggest how HelloWear theme may interfere with 3rd party extensions?

    Thank you,