Caused by: java.lang.RuntimeException: java.lang.IllegalArgumentException: Role with name forum-1-user already exists.
	at info.magnolia.module.forum.DefaultForumManager$1.doExec(DefaultForumManager.java:168)
	at info.magnolia.context.MgnlContext$VoidOp.exec(MgnlContext.java:414)
	at info.magnolia.context.MgnlContext$VoidOp.exec(MgnlContext.java:411)
	at info.magnolia.context.MgnlContext.doInSystemContext(MgnlContext.java:385)
	at info.magnolia.context.MgnlContext.doInSystemContext(MgnlContext.java:371)
	at info.magnolia.module.forum.DefaultForumManager.createForumRoles(DefaultForumManager.java:154)
	at info.magnolia.module.forum.DefaultForumManager.createForum(DefaultForumManager.java:145)
	at info.magnolia.module.forum.app.action.SaveDialogNewForumAction.execute(SaveDialogNewForumAction.java:75)
	at info.magnolia.ui.api.action.AbstractActionExecutor.execute(AbstractActionExecutor.java:74)
	... 110 more
Caused by: java.lang.IllegalArgumentException: Role with name forum-1-user already exists.
	at info.magnolia.cms.security.MgnlRoleManager.validateRoleName(MgnlRoleManager.java:254)
	at info.magnolia.cms.security.MgnlRoleManager.createRole(MgnlRoleManager.java:98)
	at info.magnolia.cms.security.MgnlRoleManager.createRole(MgnlRoleManager.java:87)
	at info.magnolia.module.forum.DefaultForumManager$1.doExec(DefaultForumManager.java:159)
	... 118 more