Documentations: WordPress Themes Basic

Fatal error: Call to undefined function mb_strtolower()

The problem with mb_strtolower PHP extension is not installed on your server. Please, ask your host for help, it may be fixed easily.

Also, you can fix it manually – https://stackoverflow.com/questions/46501099/fatal-error-call-to-undefined-function-mb-strtolower-even-if-mbstring-is-enab

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