/appinfo/app.php is deprecated, use \OCP\AppFramework\Bootstrap\IBootstrap on the application class instead.
How do I fix this error or stop this error generating in rapidfire?
This is a known issue and you should be able to fix it by changing the log level from 0 (Debug) to 1 (Info) or better to 2 (Warn).
In general, I would recommend log level 2 on a production instance. Level 0 or 1 may be useful on a test instance, or temporarily on a production instance in order to investigate a specific issue you may encounter. See also here: Logging â Nextcloud latest Administration Manual latest documentation
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