Unexpected runtime error

The runtime has encountered an unexpected error.

Error source

Page Name:/xpUI.xsp

Exception

com.ibm.xsp.exception.EvaluationExceptionEx: Error while executing JavaScript action expression
Error while executing JavaScript action expression
Script interpreter error, line=1, col=34: 'require()' is null

JavaScript code

   1: new (require("xspfw/directory")).User()

Stack Trace