This error happens on all pages with many users. I read a solution proposed by Atlassian in https://jira.atlassian.com/browse/CONF-19024 , but in my version of Confluence(3.3.1) not work. This problem is happen only in Production environment. Test Environment and development environment is OK
I just bumped into this problem and solved it reinstalling the Confluence REST API plugin.
Check the state of this plugin on your Plugin Manager. Make sure that all four modules are installed and running:
If the "Confluence Rest API" module is missing (it happens every time that I disable it), just reinstall the plugin.
The plugin JAR is "confluence-rest-plugin-3.3.1.jar" and can be found in <CONFLUENCE-INSTALL>\confluence\WEB-INF\classes\com\atlassian\confluence\setup\atlassian-bundled-plugins.zip.
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