Everytime this error occurs

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lakshman kotiki

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Jul 31, 2017, 2:42:15 AM7/31/17
to LoopbackJS
When i want to connect  my Loopback model to the datasource it is always showing this error

Validation error: invalid DataSourceDefinition
 - name: is not unique
events.js:141
      throw er; // Unhandled 'error' event
      ^
ValidationError: The `DataSourceDefinition` instance is not valid. Details: `name` is not unique (value: "mongoDs").
    at /usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/dao.js:330:12
    at ModelConstructor.<anonymous> (/usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/validations.js:511:13)
    at ModelConstructor.next (/usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/hooks.js:82:12)
    at done (/usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/validations.js:508:25)
    at /usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/validations.js:586:7
    at ModelConstructor.<anonymous> (/usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/validations.js:380:5)
    at /usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/dao.js:2006:11
    at /usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/node_modules/async/lib/async.js:396:17
    at done (/usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/node_modules/async/lib/async.js:167:19)
    at /usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/node_modules/async/lib/async.js:40:16
    at /usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/node_modules/async/lib/async.js:393:21
    at /usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/dao.js:1983:17
    at doNotify (/usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/observer.js:99:49)
    at doNotify (/usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/observer.js:99:49)
    at doNotify (/usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/observer.js:99:49)
    at doNotify (/usr/lib/node_modules/strongloop/node_modules/loopback-datasource-juggler/lib/observer.js:99:49)
this is my problem :
lot of time wasted while working on this one.
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