@dylenbrivera it's under the FAQ, the plugin system was changed for 0.4.x, so old plugins don't work unless they're updated, for now, check the github repo for recent commits (a month or 2) relating to upgrade compatibility for 0.4.x, 0.5.x should see another plugin system being added to the ACP with support for minimum version requirements.
As a side note @julian , I think information on disabling an incompatible plugin should also be included within the plugins section of the docs, as that was where I went to look for it before thinking to try FAQ. At least until the aforementioned plugin system is up and running, as it should be less of an FAQ then.