关于ECLIPSE导入工程，包找不到怎么回事

这是报的错误，在线等了～～
Severity and Description Path Resource Location Creation Time Id
Project 'roller_3.0' is missing required library: 'sandbox/jdobackend/lib/jdo2-api-2.0.jar' roller_3.0 Build path 1196904757125 44355
Project 'roller_3.0' is missing required library: 'sandbox/jdobackend/lib/jdom.jar' roller_3.0 Build path 1196904757125 44356
Project 'roller_3.0' is missing required library: 'sandbox/jdobackend/lib/jpox-1.1.0-beta-5.jar' roller_3.0 Build path 1196904757125 44357
Project 'roller_3.0' is missing required library: 'sandbox/jdobackend/lib/jpox-enhancer-1.1.0-beta-5.jar' roller_3.0 Build path 1196904757125 44358
Project 'roller_3.0' is missing required library: 'sandbox/standalone/lib/catalina.jar' roller_3.0 Build path 1196904757125 44359
Project 'roller_3.0' is missing required library: 'tools/buildtime/ant-1.6.2/ant-commons-net.jar' roller_3.0 Build path 1196904757125 44336
Project 'roller_3.0' is missing required library: 'tools/buildtime/ant-1.6.2/ant-junit.jar' roller_3.0 Build path 1196904757125 44335
Project 'roller_3.0' is missing required library: 'tools/buildtime/ant-1.6.2/ant-launcher.jar' roller_3.0 Build path 1196904757125 44334
Project 'roller_3.0' is missing required library: 'tools/buildtime/ant-1.6.2/ant.jar' roller_3.0 Build path 1196904757125 44337
Project 'roller_3.0' is missing required library: 'tools/buildtime/ant-1.6.2/commons-net-1.2.2.jar' roller_3.0 Build path 1196904757125 44333
Project 'roller_3.0' is missing required library: 'tools/buildtime/ant-1.6.2/jakarta-oro-2.0.8.jar' roller_3.0 Build path 1196904757125 44332
Project 'roller_3.0' is missing required library: 'tools/buildtime/ejb-1.1.jar' roller_3.0 Build path 1196904757125 44331
Project 'roller_3.0' is missing required library: 'tools/buildtime/hsqldb.jar' roller_3.0 Build path 1196904757125 44330
Project 'roller_3.0' is missing required library: 'tools/buildtime/junit-3.8.1.jar' roller_3.0 Build path 1196904757125 44371
Project 'roller_3.0' is missing required library: 'tools/buildtime/mockrunner-0.3/lib/mockrunner.jar' roller_3.0 Build path 1196904757125 44382
Project 'roller_3.0' is missing required library: 'tools/buildtime/strutstest-2.0.0.jar' roller_3.0 Build path 1196904757125 44372
Project 'roller_3.0' is missing required library: 'tools/buildtime/xdoclet-1.2.3/lib/xdoclet-1.2.3.jar' roller_3.0 Build path 1196904757125 44373
Project 'roller_3.0' is missing required library: 'tools/buildtime/xdoclet-1.2.3/lib/xdoclet-apache-module-1.2.3.jar' roller_3.0 Build path 1196904757125 44374
Project 'roller_3.0' is missing required library: 'tools/buildtime/xdoclet-1.2.3/lib/xdoclet-ejb-module-1.2.3.jar' roller_3.0 Build path 1196904757125 44375
Project 'roller_3.0' is missing required library: 'tools/buildtime/xdoclet-1.2.3/lib/xdoclet-hibernate-module-1.2.3.jar' roller_3.0 Build path 1196904757125 44376
Project 'roller_3.0' is missing required library: 'tools/buildtime/xdoclet-1.2.3/lib/xdoclet-java-module-1.2.3.jar' roller_3.0 Build path 1196904757125 44377
Project 'roller_3.0' is missing required library: 'tools/buildtime/xdoclet-1.2.3/lib/xdoclet-jdo-module-1.2.3.jar' roller_3.0 Build path 1196904757125 44378
Project 'roller_3.0' is missing required library: 'tools/buildtime/xdoclet-1.2.3/lib/xdoclet-web-module-1.2.3.jar' roller_3.0 Build path 1196904757125 44379
Project 'roller_3.0' is missing required library: 'tools/buildtime/xdoclet-1.2.3/lib/xdoclet-xdoclet-module-1.2.3.jar' roller_3.0 Build path 1196904757125 44380
Project 'roller_3.0' is missing required library: 'tools/buildtime/xdoclet-1.2.3/lib/xjavadoc-1.1.jar' roller_3.0 Build path 1196904757125 44381
Project 'roller_3.0' is missing required library: 'tools/buildtime/xercesImpl-2.3.0.jar' roller_3.0 Build path 1196904757125 44329
Project 'roller_3.0' is missing required library: 'tools/buildtime/xmlParserAPIs-2.3.0.jar' roller_3.0 Build path 1196904757125 44328
Project 'roller_3.0' is missing required library: 'tools/hibernate-3.1/hibernate3.jar' roller_3.0 Build path 1196904757125 44361
Project 'roller_3.0' is missing required library: 'tools/hibernate-3.1/lib/asm-attrs.jar' roller_3.0 Build path 1196904757125 44362
Project 'roller_3.0' is missing required library: 'tools/hibernate-3.1/lib/asm.jar' roller_3.0 Build path 1196904757125 44360
Project 'roller_3.0' is missing required library: 'tools/hibernate-3.1/lib/cglib-2.1.3.jar' roller_3.0 Build path 1196904757125 44363
Project 'roller_3.0' is missing required library: 'tools/hibernate-3.1/lib/dom4j-1.6.1.jar' roller_3.0 Build path 1196904757125 44364
Project 'roller_3.0' is missing required library: 'tools/hibernate-3.1/lib/ehcache-1.1.jar' roller_3.0 Build path 1196904757125 44365
Project 'roller_3.0' is missing required library: 'tools/hibernate-3.1/lib/jdbc2_0-stdext.jar' roller_3.0 Build path 1196904757125 44366
Project 'roller_3.0' is missing required library: 'tools/hibernate-3.1/lib/jta.jar' roller_3.0 Build path 1196904757125 44367
Project 'roller_3.0' is missing required library: 'tools/lib/activation.jar' roller_3.0 Build path 1196904757125 44343
Project 'roller_3.0' is missing required library: 'tools/lib/commons-betwixt-1.0-beta-1.jar' roller_3.0 Build path 1196904757125 44342
Project 'roller_3.0' is missing required library: 'tools/lib/mail.jar' roller_3.0 Build path 1196904757125 44341
Project 'roller_3.0' is missing required library: 'tools/lib/rome-0.8.jar' roller_3.0 Build path 1196904757125 44368
Project 'roller_3.0' is missing required library: 'tools/lib/rome-fetcher-0.8.jar' roller_3.0 Build path 1196904757125 44369
Project 'roller_3.0' is missing required library: 'tools/lib/velocity-1.4.jar' roller_3.0 Build path 1196904757125 44340
Project 'roller_3.0' is missing required library: 'tools/lib/velocity-dep-1.4.jar' roller_3.0 Build path 1196904757125 44339
Project 'roller_3.0' is missing required library: 'tools/lib/xmlrpc-1.2-b1.jar' roller_3.0 Build path 1196904757125 44338
Project 'roller_3.0' is missing required library: 'tools/spring-1.2/acegi-security-1.0.1.jar' roller_3.0 Build path 1196904757125 44370
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/antlr.jar' roller_3.0 Build path 1196904757125 44354
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/commons-beanutils.jar' roller_3.0 Build path 1196904757125 44353
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/commons-collections.jar' roller_3.0 Build path 1196904757125 44352
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/commons-digester.jar' roller_3.0 Build path 1196904757125 44351
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/commons-fileupload.jar' roller_3.0 Build path 1196904757125 44350
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/commons-lang-2.0.jar' roller_3.0 Build path 1196904757125 44349
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/commons-logging.jar' roller_3.0 Build path 1196904757125 44348
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/commons-validator.jar' roller_3.0 Build path 1196904757125 44347
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/jakarta-oro.jar' roller_3.0 Build path 1196904757125 44346
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/struts-el.jar' roller_3.0 Build path 1196904757125 44344
Project 'roller_3.0' is missing required library: 'tools/struts-1.2.4/lib/struts.jar' roller_3.0 Build path 1196904757125 44345
The project cannot be built until build path errors are resolved roller_3.0 Unknown 1196904757140 44383
Classpath variable 'JRE_LIB' in project 'roller_3.0' is deprecated: Use the JRE System Library instead roller_3.0 Build path 1196904757125 44327