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The WordPress Ethereum Wallet plugin has some important system requirements your hosting platform should fulfil.
PHP 7.0+
If during plugin activation you see an error like this:
WordPress Ethereum Wallet plugin requires PHP version 7.0 or above.
You need to ask your host provider to update the PHP version used for your site to be at least 7.0. The higher is better here.
GMP
Another important requirement is the PHP GMP module support. If it is not installed, plugin activation will fail with a message:
WordPress Ethereum Wallet plugin requires GMP module to be installed.
You need to ask your host provider to install the PHP GMP module in this case.
Multibyte String (mbstring)
Rarely your hosting may lacks the PHP Multibyte String (mbstring) module support. If it is not installed, plugin activation will fail with a message:
WordPress Ethereum Wallet plugin requires Multibyte String (mbstring) module to be installed.
You need to ask your host provider to install the PHP Multibyte String (mbstring) module in this case.