An error was received while processing

How can I find out more about that error?

This is what's shown in the log:

Processing TrendsController#update (for 127.0.0.1 at 2011-01-04 17:24:18) [PUT] Parameters: {"commit"=>"Update", "authenticity_token"=>"WZpPerl3dV+edWXhxLiBlNfv3KTFb0fNLVkhF3ZMNXA=", "id"=>"1", "trend"=>{"title"=>"bluiz", "description"=>"uzgz", "image"=>#}}

[paperclip] identify -format %wx%h "C:/Windows/Temp/stream20110104-3660-1j1ap8i-0.jpg[0]" 2>NUL

[paperclip] convert "C:/Windows/Temp/stream20110104-3660-1j1ap8i-0.jpg[0]" -resize "100x140>" "C:/Windows/Temp/stream20110104-3660-1j1ap8i-020110104-3660-rmkivh-0" 2>NUL

[paperclip] An error was received while process开发者_StackOverflow社区ing: #

I had to put the PATH-entries for ImageMagick and FFMPEG before system32 in the environment-variables, because it tried to use Windows' own convert-command.