How to restart the Hyperledger Composer Playground locally

npm uninstall -g composer-playground

npm install -g composer-playground 

npm ls -g --depth==0 |grep playground

return query('selectPerson', {firstName: 'joe'} )
    .then(function (results) {

       for (var n = 0; n < results.length; n++) {
               var person = results[n];
               console.log('person is ' + (n+1) + ', object is ' +  person);
               console.log('person identifier is ' + person.getIdentifier());

         return personRegistry.get(person.getIdentifier())
         .then(function (personRecord) {
            console.log('object is ' + personRecord); // all good
           console.log('identifier is ' + person.getIdentifier() );
         })



       } // for

  }) //function