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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:896)	at com.atlassian.jira.issue.fields.screen.DefaultFieldScreenSchemeManager.getFieldScreenScheme(DefaultFieldScreenSchemeManager.java:71)	at com.atlassian.jira.web.action.admin.issuefields.screens.AbstractFieldScreenSchemeAction.getFieldScreenScheme(AbstractFieldScreenSchemeAction.java:61)	at com.atlassian.jira.web.action.admin.issuefields.screens.AbstractFieldScreenSchemeAction.validateId(AbstractFieldScreenSchemeAction.java:111)	at com.atlassian.jira.web.action.admin.issuefields.screens.ConfigureFieldScreenScheme.doValidation(ConfigureFieldScreenScheme.java:28)	at webwork.action.ActionSupport.validate(ActionSupport.java:391)	at webwork.action.ActionSupport.execute(ActionSupport.java:162)	at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:82)	at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:39)	at webwork.interceptor.NestedInterceptorChain.proceed(NestedInterceptorChain.java:31)	at webwork.interceptor.ChainedInterceptor.intercept(ChainedInterceptor.java:16)	at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:35)	at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:221)	at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:150)	at com.atlassian.jira.web.dispatcher.JiraWebworkActionDispatcher.service(JiraWebworkActionDispatcher.java:153)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at com.atlassian.jira.web.filters.steps.ChainedFilterStepRunner.doFilter(ChainedFilterStepRunner.java:78)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at com.atlassian.core.filters.HeaderSanitisingFilter.doFilter(HeaderSanitisingFilter.java:44)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)