“undefined” error when trying to install plugins or import demos

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Zlib Compression is enabled

Due to the pattern i noticed, this is likely caused by the PHP variable “zlib.output_compression” being enabled.

To disable it, try editing one of these:

.htaccess file

php_flag zlib.output_compression Off

php.ini file

zlib.output_compression Off

.user.ini file

zlib.output_compression Off

SSL is not properly setup

If your site is using a SSL certificate, try accessing WP backend > Settings and make sure the Site Address and WordPress address URL’s both have “https” inside.

Upgrade PHP version

Please make sure you’re running a recent version of PHP like 7.3+ .

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