# Thread: Error building application - ClassRequire

1. ## Error building application - ClassRequire

Hi,
I'm having a problem with sencha cmd app watch; Below the error:

[ERR] com.sencha.exceptions.ExBuild: Failed to find any files for path\to\view\Form.js::ClassRequire::Ext.ux.form.MultiSelect
The strange thing is that the "MultiSelect.js" file is present in the the ext/packages/ux/classic/src/form folder; I put a new entry in bootstrap.json => paths this way:

"Ext.ux.form.MultiSelect": "ext/packages/ux/classic/src/form/MultiSelect.js",
This actually fixed the problem, at least this fixes the problems in browser, after the app is deployed..... but, the server won't start because of the error above.

Anyone of you ever faced things like this?

Any help appreciated,
Thanks

2. Hi--,

You likely just need to add the ux to your requires (app.json).

If you modify/add the following to your app.json does it produce a better result?

PHP Code:
 "requires": [    "font-awesome",    "ux"],  
Best!
Bryan

3. Thanks!this worked like a charm