No such file to load -- RMagick.so

hi all
i installed file_column plugin and Rmagick

so when i start webrick and go to photo administration i see this
message “no such file to load – RMagick.so”
if i reload the page it’s all right…

the problem return when i restart webrick

is possible that the first time that i use file_column Rmagick is not
loaded?