在Appcelerator ACS中使用ACL时出错

I am trying to use the ACL functionality to control what posts a user can share with others. When I associate an ACL (through the ACS Management console using a browser) to a post, than I get the following error: "[ERROR][TiJSError( 629)] (main) [1,124536] - Message: Uncaught TypeError: Cannot read property 'username' of undefined"I am trying to use the ACL functionality to con