Team Calendars disabled at startup on Confluence 5.7.x

2015-08-04 17:20:38,171 WARN [localhost-startStop-1] [osgi.container.felix.FelixOsgiContainerManager] doLog Unable to resolve bundle 20: Unresolved constrai
nt in bundle com.atlassian.confluence.extra.team-calendars [20]: Unable to resolve 20.0: missing requirement [20.0] package; (&(package=com.atlassian.active
objects.external)(version>=0.22.2))
2015-08-04 17:20:38,171 ERROR [localhost-startStop-1] [plugin.osgi.factory.OsgiPluginInstalledHelper] getRequiredPlugins Cannot determine required plugins, 
cannot resolve bundle 'com.atlassian.confluence.extra.team-calendars'
2015-08-04 17:20:41,147 WARN [localhost-startStop-1] [osgi.container.felix.FelixOsgiContainerManager] doLog Unable to resolve bundle 20: Unresolved constrai
nt in bundle com.atlassian.confluence.extra.team-calendars [20]: Unable to resolve 20.0: missing requirement [20.0] package; (&(package=com.atlassian.active
objects.external)(version>=0.22.2))
2015-08-04 17:20:41,781 ERROR [localhost-startStop-1] [plugin.osgi.factory.OsgiPlugin] enableInternal Detected an error (BundleException) enabling the plugi
n 'com.atlassian.confluence.extra.team-calendars' : Unresolved constraint in bundle com.atlassian.confluence.extra.team-calendars [20]: Unable to resolve 20
.0: missing requirement [20.0] package; (&(package=com.atlassian.activeobjects.external)(version>=0.22.2)).  This error usually occurs when your plugin impo
rts a package from another bundle with a specific version constraint and either the bundle providing that package doesn't meet those version constraints, or
 there is no bundle available that provides the specified package. For more details on how to fix this, see https://developer.atlassian.com/x/mQAN
2015-08-04 17:20:41,782 WARN [localhost-startStop-1] [atlassian.plugin.impl.AbstractPlugin] enable Unable to enable plugin 'com.atlassian.confluence.extra.t
eam-calendars'
2015-08-04 17:20:41,783 WARN [localhost-startStop-1] [atlassian.plugin.impl.AbstractPlugin] enable Because of this exception
com.atlassian.plugin.osgi.container.OsgiContainerException: Cannot start plugin: com.atlassian.confluence.extra.team-calendars
        at com.atlassian.plugin.osgi.factory.OsgiPlugin.enableInternal(OsgiPlugin.java:479)
        at com.atlassian.plugin.impl.AbstractPlugin.enable(AbstractPlugin.java:310)
        at com.atlassian.plugin.manager.PluginEnabler.actualEnable(PluginEnabler.java:136)
        at com.atlassian.plugin.manager.PluginEnabler.enable(PluginEnabler.java:104)
...
Caused by: org.osgi.framework.BundleException: Unresolved constraint in bundle com.atlassian.confluence.extra.team-calendars [20]: Unable to resolve 20.0: missing requirement [20.0] package; (&(package=com.atlassian.activeobjects.external)(version>=0.22.2))
        at org.apache.felix.framework.Felix.resolveBundle(Felix.java:3409)
        at org.apache.felix.framework.Felix.startBundle(Felix.java:1709)
        at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:905)
        at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:892)
        at com.atlassian.plugin.osgi.factory.OsgiPlugin.enableInternal(OsgiPlugin.java:456)
        ... 18 more
2015-08-04 17:20:41,784 ERROR [localhost-startStop-1] [atlassian.plugin.manager.PluginEnabler] actualEnable Unable to enable plugin com.atlassian.confluence.extra.team-calendars
com.atlassian.plugin.osgi.container.OsgiContainerException: Cannot start plugin: com.atlassian.confluence.extra.team-calendars
        at com.atlassian.plugin.osgi.factory.OsgiPlugin.enableInternal(OsgiPlugin.java:479)
        at com.atlassian.plugin.impl.AbstractPlugin.enable(AbstractPlugin.java:310)
        at com.atlassian.plugin.manager.PluginEnabler.actualEnable(PluginEnabler.java:136)
        at com.atlassian.plugin.manager.PluginEnabler.enable(PluginEnabler.java:104)
        at com.atlassian.plugin.manager.DefaultPluginManager.addPlugins(DefaultPluginManager.java:1199)
...
Caused by: org.osgi.framework.BundleException: Unresolved constraint in bundle com.atlassian.confluence.extra.team-calendars [20]: Unable to resolve 20.0: missing requirement [20.0] package; (&(package=com.atlassian.activeobjects.external)(version>=0.22.2))