Only one plugin can own that file, and we will not overwrite somebody else's — two page caches on one site is how a shop ends up showing the wrong prices.
Deactivate the other caching plugin. The next admin page you open puts NimbleCache's fast path in its place, and adds WP_CACHE back if the other plugin took it out of wp-config.php. Set up caching again on Diagnostics does the same straight away.
Still stuck? Ask the developers who wrote it. We aim to reply within one business day.
NimbleCache
Serve your pages before the plugins load — and never touch a setting to do it.
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