Unexpected runtime error

The runtime has encountered an unexpected error.

Error source

Page Name:/events.xsp
Control Id: _id80

Exception

com.ibm.xsp.exception.EvaluationExceptionEx: Error while executing JavaScript computed expression
Error while executing JavaScript computed expression
Script interpreter error, line=1, col=86: Error calling method 'format(string)' on java class 'java.text.SimpleDateFormat'
Cannot format given Object as a Date

JavaScript code

   1: java.text.DateFormat.getDateInstance(java.text.DateFormat.FULL, context.getLocale()).format(date);

Stack Trace