i recently changed something in new farr version that was fixing an old oversight and it may have broken these 2 plugins. basically farr was passing the search keyword in the search string to the plugin, and it shouldn't. the fix made klipkeeper start working again, but its possible that these two plugins depend on that bug and need to be rebuilt..
I don't think that's the problem... I have both those plugins installed and no problem whatsoever.
@kartal: Try removing both those plugins, and install some other c# plugin, like FARREnvironmentVariables or something. See what happens? If it breaks, i suspect something with c# sdk and your system is not right. If everything is alright then it is something with the plugins in question.
Also try finding c:\FARRCalendar.log or <farrinstalldir>\calendar.log or <plugindir>\calendar\calendar.log (i know i should make this better but i don't know which version of the plugin you have and I was in the middle of moving the logs between the versions...) and see if it was changed recently...