Problem building in local setup

When I tried to build the project in local setup prompt me this error:

`ERROR in ./src/index.js
Module not found: Error: Cannot resolve 'file' or 'directory' ./ButtonGroup.vue in /vue-strap/src
 @ ./src/index.js 33:19-47
`
I think is because the name of this component was changed for buttonGroup.vue in lowercase.