The Reviews plugin was added to OJS 2.3, and may not be backwards-compatible with OJS 2.2.x. You can find the original plugin code here: https://github.com/pkp/ojs/commit/f6b15 ... 55af7280b3
and here: http://pkp.sfu.ca/bugzilla/show_bug.cgi?id=4231
. There are no guarantees that it will work in OJS 2.2.x, and that code doesn't include any fixes that have since been added; additionally, we won't typically roll back 2.3.x plugins for 2.2.x use. You may be better served off upgrading your OJS to the most recent stable version, which does include the report plugin.