An unexpected error occurred. Class 'voku\helper\UTF8' not found

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An unexpected error occurred.
Class 'voku\helper\UTF8' not found

I get this error message when installed Concrete5 8.2.1

anyone know that the problem is?

BlackhatEspeed
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MrKDilkington replied on at Permalink Reply
MrKDilkington
Hi BlackhatEspeed,

I would check to see if enabling the "mbstring" PHP extension resolves this.