Stash Avatar causing 500 error in JIRA

2015-05-28 15:51:20,247 ERROR [http-nio-127.0.0.1-13152-exec-26] vertecs-admin @1NBMRVEx951x3856634x2 1elvq2q 158.166.145.29,158.166.164.6,127.0.0.1 "GET /rest/projectCategories/latest/project/undefined HTTP/1.1" c.a.p.r.c.e.j.ThrowableExceptionMapper Uncaught exception thrown by REST service: com.atlassian.stash.project.ProjectService.findByKey(Ljava/lang/String;)Lcom/atlassian/stash/project/Project;
java.lang.NoSuchMethodError: com.atlassian.stash.project.ProjectService.findByKey(Ljava/lang/String;)Lcom/atlassian/stash/project/Project;
	at de.communardo.plugin.stash.projectcategories.rest.ProjectResource.getCategories(ProjectResource.java:43) ~[plugin.1772638486487555108.stash-project-categories-0.4-09efb82_1394889835000.jar:na]
	at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:25) [applinks-plugin-4.3.5_1418190064000.jar:na]
	at com.atlassian.stash.internal.spring.security.StashAuthenticationFilter.doFilter(StashAuthenticationFilter.java:86) [StashAuthenticationFilter.class:na]
	at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doInsideSpringSecurityChain(BeforeLoginPluginAuthenticationFilter.java:111) [BeforeLoginPluginAuthenticationFilter.class:na]
	at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doFilter(BeforeLoginPluginAuthenticationFilter.java:77) [BeforeLoginPluginAuthenticationFilter.class:na]
	at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:100) [atlassian-trusted-apps-core-3.0.8.jar:na]
	at com.atlassian.oauth.serviceprovider.internal.servlet.OAuthFilter.doFilter(OAuthFilter.java:79) [atlassian-oauth-service-provider-plugin-1.9.9_1418190064000.jar:na]
	at com.atlassian.analytics.client.filter.DefaultAnalyticsFilter.doFilter(DefaultAnalyticsFilter.java:32) [analytics-client-3.53_1418190066000.jar:na]
	at com.atlassian.analytics.client.filter.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32) [analytics-client-3.53_1418190066000.jar:na]
	at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doBeforeBeforeLoginFilters(BeforeLoginPluginAuthenticationFilter.java:89) [BeforeLoginPluginAuthenticationFilter.class:na]
	at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doFilter(BeforeLoginPluginAuthenticationFilter.java:75) [BeforeLoginPluginAuthenticationFilter.class:na]
	at com.atlassian.stash.internal.request.DefaultRequestManager.doAsRequest(DefaultRequestManager.java:85) [stash-service-impl-3.6.1.jar:na]
	at com.atlassian.stash.internal.hazelcast.ConfigurableWebFilter.doFilter(ConfigurableWebFilter.java:38) [ConfigurableWebFilter.class:na]
	at ec.europa.eu.digit.citnet.stash.AuthenticatedUserFilter.doFilter(AuthenticatedUserFilter.java:87) [AuthenticatedUserFilter.class:na]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_51]
	at java.lang.Thread.run(Thread.java:744) [na:1.7.0_51]
	... 199 frames trimmed