java.lang.UnsupportedOperationException
	at java.util.Collections$UnmodifiableCollection.clear(Collections.java:1074)
	at com.michelin.cio.hudson.plugins.rolestrategy.RoleMap.clearSidsForRole(RoleMap.java:208)
	at com.michelin.cio.hudson.plugins.rolestrategy.RoleMap.clearSids(RoleMap.java:248)
	at com.michelin.cio.hudson.plugins.rolestrategy.RoleBasedAuthorizationStrategy$DescriptorImpl.doAssignSubmit(RoleBasedAuthorizationStrategy.java:696)
	at com.michelin.cio.hudson.plugins.rolestrategy.RoleStrategyConfig.doAssignSubmit(RoleStrategyConfig.java:165)
	at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
	at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:396)
	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:408)
	at org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:77)
	at org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)
	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:212)
	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:145)
	at org.kohsuke.stapler.MetaClass$11.doDispatch(MetaClass.java:537)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:739)