Sugar返回undefined {“content”：“在弹出单击菜单链接时

I have installed a fresh version of SugarCRM 'Suite'. Things are working fine but whenever I click on a menu a pop-up appears with {"content":". I have looked in their developer works, forums, googled the issue, but no concrete solution, not even a concrete explanation. I know it can be bypassed if I disable the modules from 'Configure AJAX User Interface' in the Admin section, but this only disables Ajax.I have installed a fresh version of SugarCRM 'S