MongooseError: Can't call `openUri()` on an active connection with different connection strings.

[MeanDevMaster]

I get this error when trying to start the server.

MongooseError: Can't call openUri() on an active connection with different connection strings. Make sure you aren't calling mongoose.connect() multiple times. See: https://mongoosejs.com/docs/connections.html#multiple_connections at NativeConnection.Connection.openUri (C:\Users\Master\Desktop\Chat-master\node_modules\mongoose\lib\connection.js:693:13) at C:\Users\Master\Desktop\Chat-master\node_modules\mongoose\lib\index.js:345:10 at C:\Users\Master\Desktop\Chat-master\node_modules\mongoose\lib\helpers\promiseOrCallback.js:31:5 at new Promise () at promiseOrCallback (C:\Users\Master\Desktop\Chat-master\node_modules\mongoose\lib\helpers\promiseOrCallback.js:30:10) at Mongoose._promiseOrCallback (C:\Users\Master\Desktop\Chat-master\node_modules\mongoose\lib\index.js:1135:10) at Mongoose.connect (C:\Users\Master\Desktop\Chat-master\node_modules\mongoose\lib\index.js:344:20) at Object. (C:\Users\Master\Desktop\Chat-master\model\model.js:15:10) at Module._compile (node:internal/modules/cjs/loader:1108:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1137:10) at Module.load (node:internal/modules/cjs/loader:973:32) at Function.Module._load (node:internal/modules/cjs/loader:813:14) at Module.require (node:internal/modules/cjs/loader:997:19) at require (node:internal/modules/cjs/helpers:92:18) at Object. (C:\Users\Master\Desktop\Chat-master\controller\controller.js:1:14) at Module._compile (node:internal/modules/cjs/loader:1108:14) [nodemon] app crashed - waiting for file changes before starting...

[severinkrystyan]

Try commenting out line 19 in the model/model.js file which says, mongoose.connect('mongodb://localhost/mongodb')

Since line 5 already established a connection, I am not sure why the duplicate is needed.

This worked for me.