Error Class 'Prism\Utilities\StringHelper' not found after Joomla update

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InMotionFans
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After updating to the latest version of Joomla, accessing my website returns the following error :
"Class 'Prism\Utilities\StringHelper' not found" How can I fix this?
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CaseyB
Hello, Thank you for your question regarding the Class error you are seeing on your website. I recommend that you first make a backup of all your files, and databases. Then you should go to the Joomla! website and download a copy of the 'Update Package' for the version of Joomla! you were upgrading to. For example, if you were upgrading from Joomla! 2.5 through 3.3 up to 3.6.4 you can select the appropriate file from the Joomla! releases page for 3.6.4 Once you have the right file you will need to unpack it in your base Joomla! directory and overwrite the core Joomla! files. Finally, please note that you want the 'Update Package', and not the 'Full Package' or the 'Patch Package'. Gratefully, Casey B.