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MongoError: ns not found when try to drop collection

Full error message

Mongoose throw an error i.e, "MongoError: ns not found" when i try to drop collection.

Here is my mongoose code:

var mongoose = require('bluebird').promisifyAll(require('mongoose'));
......
......
......   
mongoose.connection.db.dropCollection("myCollection",function(err,affect){
   console.log('err',err);

})

Error:

  err { [MongoError: ns not found]

  name: 'MongoError',

   message: 'ns
  not found',

  ok: 0,

  errmsg: 'ns not found' }

Solutionsource: stackoverflow \u2197

MongoError: ns not found occurs when performing actions on collections that don't exist. For example, attempting to drop indexes before an explicit collection creation has occurred or before adding a document to the collection which implicitly creates the collection.

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