resin出现问题：java.lang.Error: Unresolved compilation problems:com.caucho cannot be

最近resin不知道怎么出现问题了。resin启开后，登陆JSP页面等都正常，但后台提示错误！请各位帮帮忙！
resin-file: init
java.lang.Error: Unresolved compilation problems:
com.caucho cannot be resolved to a type
com.caucho cannot be resolved to a type
The method _caucho_getApplication() is undefined for the type _x

com.caucho cannot be resolved to a type
com.caucho.jsp.QJspFactory cannot be resolved to a type
The method getServletConfig() is undefined for the type _xsdl__j

Type mismatch: cannot convert from _xsdl__jsp to Servlet
com.caucho.jsp.QJspFactory cannot be resolved to a type
com.caucho cannot be resolved to a type
com.caucho.jsp.JavaPage cannot be resolved to a type
com.caucho.util cannot be resolved
com.caucho cannot be resolved to a type
com.caucho.make.Dependency cannot be resolved to a type
JavaPage cannot be resolved to a type
com.caucho cannot be resolved to a type
com.caucho cannot be resolved to a type
com.caucho.util cannot be resolved
com.caucho cannot be resolved to a type
com.caucho cannot be resolved to a type
com.caucho cannot be resolved to a type
com.caucho.loader.DynamicClassLoader cannot be resolved to a typ

com.caucho cannot be resolved to a type
com.caucho cannot be resolved to a type
com.caucho.jsp.JavaPage cannot be resolved to a type

at _jsp._oa._learn_04._xsdl__jsp.<init>(_xsdl__jsp.java:19)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeC
sorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Del
torAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:51

at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at com.caucho.jsp.JspManager.preload(JspManager.java:302)
at com.caucho.jsp.JspManager.compile(JspManager.java:210)
at com.caucho.jsp.JspManager.createPage(JspManager.java:177)
at com.caucho.jsp.JspManager.createPage(JspManager.java:157)
at com.caucho.jsp.PageManager.getPage(PageManager.java:248)
at com.caucho.jsp.PageManager.getPage(PageManager.java:166)
at com.caucho.jsp.QServlet.getSubPage(QServlet.java:292)
at com.caucho.jsp.QServlet.getPage(QServlet.java:210)
at com.caucho.server.dispatch.PageFilterChain.compilePage(PageFi
206)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilte
)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFil
73)
at com.caucho.server.dispatch.ServletInvocation.service(ServletI
229)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.

at com.caucho.server.port.TcpConnection.run(TcpConnection.java:5

at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:516)
at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
at java.lang.Thread.run(Thread.java:619)
Loading .tld files from global classpath
Compiling _jsp/_oa/_learn_04/_xsdl__jsp.java