开源项目openmeetings问题请教

开源项目openmeetings问题请教.
我上专文档时,文件转化成缩略图报错,也就是ImageMagick插件调用出了问题,找不到原因,会不会是版本问题呢?哪位高手赐教一下,谢谢!!
报错信息:

Value: 2010-3-11 10:28:51 com.artofsolving.jodconverter.openoffice.connection.AbstractOpenOfficeConnection connect信息: connected2010-3-11 10:29:44 com.artofsolving.jodconverter.openoffice.connection.AbstractOpenOfficeConnection disposing信息: disconnected
Name: process
Value: doJodConvert
Name: exitValue
Value: 0
Name: process
Value: generateXMLDocument
Name: exitValue
Value: 4
Name: command
Value: [convert.exe, -thumbnail, 80, G:\test-openmeeting\openmeetings_1_0_r2688\.\webapps\openmeetings\upload\9\ImageMagick_2\ImageMagick.pdf, G:\test-openmeeting\openmeetings_1_0_r2688\.\webapps\openmeetings\upload\9\ImageMagick_2\_thumb_page-%04d.jpg]
Name: error
Value: Invalid Parameter - 80
Name: process
Value: generateBatchThumb
Name: exitValue
Value: 0
Name: process
Value: processPDF
Name: exitValue
Value: 0
Name: command --------------------编程问答-------------------- 有没有人帮忙一下阿. --------------------编程问答--------------------

补充：Java ,  Web 开发