I'm getting this error also
Code:
L 07/05/2013 - 10:08:15: SourceMod error session started
L 07/05/2013 - 10:08:15: Info (map "achievement_idle_noglass_BBG") (file "errors_20130705.log")
L 07/05/2013 - 10:08:15: [SM] Plugin encountered error 4: Invalid parameter or parameter type
L 07/05/2013 - 10:08:15: [SM] Native "PrintToServer" reported: String formatted incorrectly - parameter 2 (total 1)
L 07/05/2013 - 10:08:15: [SM] Displaying call stack trace for plugin "friendly.smx":
L 07/05/2013 - 10:08:15: [SM] [0] Line 2046, friendly.sp::Updater_OnPluginUpdated()