There's a syntax error in ionic.config.json file:

First I am developed on my localhost.
http://localhost:8080/rajivbackend/

In order to ignore CORS, I set proxy to ionic.config.json file.
It’s success , so I uploaded my backend files in my server there.
http://rajiv.dorintoworld.com

Server is correct, but result is incorrect.
When I build Ionic app, not build and appear following error.

    Uh oh! There's a syntax error in your ionic.config.json file:
SyntaxError: Unexpected token / in JSON at position 130
    at Object.parse (native)
    at Object.load (C:\Users\Donbelar\AppData\Roaming\npm\node_modules\ionic\node_modules\ionic-app-lib\lib\project.js:48:17)
    at Object.runr (C:\Users\Donbelar\AppData\Roaming\npm\node_modules\ionic\lib\cli.js:156:32)
    at C:\Users\Donbelar\AppData\Roaming\npm\node_modules\ionic\lib\cli.js:54:9
    at _fulfilled (C:\Users\Donbelar\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:787:54)
    at self.promiseDispatch.done (C:\Users\Donbelar\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:816:30)
    at Promise.promise.promiseDispatch (C:\Users\Donbelar\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:749:13)
    at C:\Users\Donbelar\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:557:44
    at flush (C:\Users\Donbelar\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:108:17)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)