The atlassian-wallboard-plugin-1.5.2.jar was bundled with JIRA 4.4 in the August 2011 release. Unfortunately this plugin only became JIRA 4.4 compatible from version 1.6 (see https://plugins.atlassian.com/plugin/matrix/23983).

As far as we know, the plugin still works except for the Twitter integration.

The plugin should be upgraded to the latest version (1.6.3 at the time of writing).