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[ENXF NET]

I'm upgrading a forum from 2.2 to 2.3 and I got the following warning.
What can I do?
Thanks

The following warnings were detected when verifying that your server can run XenForo:

• Your server has disabled a core PHP function <strong>exec</strong> via the disable_functions directive in php.ini. This may cause unexpected problems in XenForo.
• Your server has disabled a core PHP function <strong>popen</strong> via the disable_functions directive in php.ini. This may cause...

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