Seems valve has managed to break your extension again on windows. Another small update from them and it no longer functions.
Might also be worth noting that a "sm exts list" command returns your plugin version as 0.2.1 even though I've installed the 0.2.2 files twice and restarted the server twice.
Though the day I installed 2.2 for the first time, the ext began working again immediately so I don't think the wrong version is loaded.