ckfinder 看不到缩略图

补充：
为了选择插入图片，点击“浏览服务器”时后台报错：
2012-5-23 10:15:21 org.apache.catalina.core.StandardWrapperValve invoke
??: Servlet.service() for servlet [ConnectorServlet] in context with path [/gggl] threw exception [Servlet execution threw an exception] with root cause
org.apache.tomcat.util.http.parser.TokenMgrError: Lexical error at line 1, column 17.  Encountered: ":" (58), after : ""
at org.apache.tomcat.util.http.parser.HttpParserTokenManager.getNextToken(HttpParserTokenManager.java:434)
at org.apache.tomcat.util.http.parser.HttpParser.jj_consume_token(HttpParser.java:260)
at org.apache.tomcat.util.http.parser.HttpParser.Parameter(HttpParser.java:99)
at org.apache.tomcat.util.http.parser.HttpParser.MediaType(HttpParser.java:30)
at org.apache.catalina.connector.Response.setContentType(Response.java:807)
at org.apache.catalina.connector.ResponseFacade.setContentType(ResponseFacade.java:245)
at com.ckfinder.connector.handlers.command.ThumbnailCommand.setResponseHeader(ThumbnailCommand.java:68)
at com.ckfinder.connector.handlers.command.Command.runCommand(Command.java:75)
at com.ckfinder.connector.ConnectorServlet$CommandHandlerEnum.execute(ConnectorServlet.java:419)
at com.ckfinder.connector.ConnectorServlet$CommandHandlerEnum.access$000(ConnectorServlet.java:308)
at com.ckfinder.connector.ConnectorServlet.getResponse(ConnectorServlet.java:168)
at com.ckfinder.connector.ConnectorServlet.doGet(ConnectorServlet.java:83)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.ckfinder.connector.FileUploadFilter.doFilter(FileUploadFilter.java:67)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1812)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)