The following error occurred while installing the Ngram plugin: The
IntlBreakIterator class (part of PHP’s intl extension) does not exist.
It must exist to install this plugin.
I got in touch with my server and they said to contact the plugin creator.
Can you share the information in the “System Information” link at the bottom of every admin page?
This sounds like a straightforward problem about dependencies and what your server has installed, but the information from that page will help make certain.