When I add an environment variable from configure page I got the following message:

Status Code: 500

Exception:
Stacktrace:
java.lang.RuntimeException: Failed to instantiate class hudson.slaves.EnvironmentVariablesNodeProperty from {"env":"\"[

{\"key\":\"CXX\",\"value\":\"ccache g++\"}

,

{\"key\":\"CC\",\"value\":\"ccache gcc\"}

]\""}
at hudson.model.Descriptor.newInstance(Descriptor.java:543)
at hudson.slaves.NodeProperty.reconfigure(NodeProperty.java:117)
at hudson.slaves.NodeProperty.reconfigure(NodeProperty.java:70)
at hudson.util.DescribableList.rebuild(DescribableList.java:152)
at hudson.model.Hudson.doConfigSubmit(Hudson.java:2604)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:282)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:149)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:88)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:103)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:561)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:646)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:477)
at org.kohsuke.stapler.Stapler.service(Stapler.java:159)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
at winstone.ServletConfiguration.execute(ServletConfiguration.java:249)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:335)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:378)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:124)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:174)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:66)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:244)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.slaves.EnvironmentVariablesNodeProperty from {"env":"\"[

{\"key\":\"CXX\",\"value\":\"ccache g++\"}

,

{\"key\":\"CC\",\"value\":\"ccache gcc\"}

]\""}
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:628)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:372)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:368)
at hudson.model.Descriptor.newInstance(Descriptor.java:534)
... 55 more
Caused by: java.lang.IllegalArgumentException: Failed to convert the env parameter of the constructor public hudson.slaves.EnvironmentVariablesNodeProperty(java.util.List)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:622)
... 58 more
Caused by: java.lang.IllegalArgumentException: Unable to convert to interface java.util.List
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:689)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:372)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:620)
... 58 more

Generated by Winstone Servlet Engine v0.9.10 at Tue Nov 15 19:28:22 JST 2011