why value set provider script can not work properly suddenly?

 Error invoking value set provider '.....' in the project area with id '.....'. 

You can link to the project area definition using a URL similar to https://thehostname:9443/jazz/process/project-areas/...., where the host name, port and jazz context are configured for your installation. Contact your project area administrator for assistance.$

 java.lang.ArrayIndexOutOfBoundsException

     So, to simplify the condition, we disable all scripts to connect to any attribute, disable all conditions/default value/calculated Value with script, i.e. no script will be run, and only associate a string type attribute with a value set provider script provided by RTC as Fill in example.

      

      But result is still the same, RTC refuse to connect script with attribute with ArrayIndexOutOfBoundsException error, which is really confusing.   

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dojo.provide("com.tst.release.ValueSetProvider");

(function() {
    dojo.declare("com.tst.release.ValueSetProvider", null, {

        getValueSet: function(attributeId, workItem, configuration) {
       
            var result= [];
            result.push("a");
            result.push("b");
            var myOldValue = workItem.getValue(attribute);
            return myOldValue;
           
        }
   });
})();

         We are wondering how we should resolve issue like this? 

         Thanks!

Best Regards,

Jane