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In my fairly complex build I’ve started to get this error when I run Gradle:
> Error resolving plugin [id: ‘FOO’, version: ’1.+’]
> > The request for this plugin could not be satisfied because the plugin is already on the classpath with an unknown version, so compatibility cannot be checked.
(FOO is a plugin we’re using.)

If I remove the version from the FOO plugin, I get this error (from a different invocation of Gradle):

> Plugin [id: ‘FOO’] was not found in any of the following sources:
> - Gradle Core Plugins (not a core plugin. For more available plugins, please refer to <https://docs.gradle.org/8.9/userguide/plugin_reference.html> in the Gradle documentation.)
> - Included Builds (None of the included builds contain this plugin)
> - Plugin Repositories (plugin dependency must include a version number for this source)
What should I do? Also, why did I not get this error originally but only started to get it once I tried running `./gradlew --refresh-dependencies`?

Looks like adding the plugins to the root build with `apply false` is the solution.

Though I’d still like to understand why it worked for some time and then stopped.