Block parameters are not working.

[sourabhdattawad]

I'm using Handlebars(4.0.5) with express.js. Block params when used throws following error. ...ll_cities.values as |city cityId|}} -----------------------^ Expecting 'CLOSE', 'CLOSE_UNESCAPED', 'STRING', 'INTEGER', 'BOOLEAN', 'OPEN_SEXPR', 'CLOSE_SEXPR', 'ID', 'EQUALS', 'DATA', 'SEP', got 'INVALID'
Code:
{{#each this.all_cities.values as |city cityId|}} City is {{city.name}} {{/each}}
this.all_cities.values is an array of object.
I'm using block params to resolve name conflict when nested.