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I was updating wordpress, throught it was done. I downloaded Astra ... I am new to all this. Thank you for your help

Fatal error: Call to undefined function is_customize_preview() in /home/content/21/7421521/html/wp-content/themes/astra/inc/customizer/class-astra-customizer.php on line 70

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  • Disable the plugin. The error message is telling you the astra customizer is looking for a function that does not exist. Either the plugin did not install correctly or it is flawed. Either way, deactivating it will get your site up and running again.
    – jdm2112
    Commented May 31, 2019 at 21:47

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Try reinstalling WordPress from scratch. Replace everything except your wp-config.php file, .htaccess file, nginx.conf file, and wp-contents/ directory.

This error is calling a missing function that's a part of WordPress core since 4.0.0.

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