Github user Leemoonsoo commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/34#issuecomment-114658042
Existing user who has build zeppelin will see this error without removing
zeppelin-web/bower_components directory.
```
[INFO] --- frontend-maven-plugin:0.0.23:bower (bower install) @
zeppelin-web ---
[INFO] Running 'bower --allow-root install' in
/Users/moon/Projects/zeppelin/zeppelin-web
[INFO] bower angular-sanitize#1.2.28 cached
git://github.com/angular/bower-angular-sanitize.git#1.2.28
[INFO] bower angular-sanitize#1.2.28 validate 1.2.28 against
git://github.com/angular/bower-angular-sanitize.git#1.2.28
[INFO] bower angular-cookies#1.2.28 cached
git://github.com/angular/bower-angular-cookies.git#1.2.28
[INFO] bower angular-cookies#1.2.28 validate 1.2.28 against
git://github.com/angular/bower-angular-cookies.git#1.2.28
[INFO] bower angular-route#1.2.28 cached
git://github.com/angular/bower-angular-route.git#1.2.28
[INFO] bower angular-route#1.2.28 validate 1.2.28 against
git://github.com/angular/bower-angular-route.git#1.2.28
[INFO] bower angular-animate#1.2.28 cached
git://github.com/angular/bower-angular-animate.git#1.2.28
[INFO] bower angular-animate#1.2.28 validate 1.2.28 against
git://github.com/angular/bower-angular-animate.git#1.2.28
[INFO] bower ng-sortable#1.1.6 cached
git://github.com/a5hik/ng-sortable.git#1.1.6
[INFO] bower ng-sortable#1.1.6 validate 1.1.6 against
git://github.com/a5hik/ng-sortable.git#1.1.6
[INFO] bower angular-scenario#1.2.28 cached
git://github.com/angular/bower-angular-scenario.git#1.2.28
[INFO] bower angular-scenario#1.2.28 validate 1.2.28 against
git://github.com/angular/bower-angular-scenario.git#1.2.28
[INFO] bower angular-mocks#1.2.28 cached
git://github.com/angular/bower-angular-mocks.git#1.2.28
[INFO] bower angular-mocks#1.2.28 validate 1.2.28 against
git://github.com/angular/bower-angular-mocks.git#1.2.28
[INFO] bower angular-touch#1.2.28 cached
git://github.com/angular/bower-angular-touch.git#1.2.28
[INFO] bower angular-touch#1.2.28 validate 1.2.28 against
git://github.com/angular/bower-angular-touch.git#1.2.28
[INFO] bower angular#1.2.x cached
git://github.com/angular/bower-angular.git#1.2.28
[INFO] bower angular#1.2.x validate 1.2.28 against
git://github.com/angular/bower-angular.git#1.2.x
[INFO] bower angular#1.2.28 cached
git://github.com/angular/bower-angular.git#1.2.28
[INFO] bower angular#1.2.28 validate 1.2.28 against
git://github.com/angular/bower-angular.git#1.2.28
[INFO] bower angular#>=1 cached
git://github.com/angular/bower-angular.git#1.4.1
[INFO] bower angular#>=1 validate 1.4.1 against
git://github.com/angular/bower-angular.git#>=1
[INFO] bower angular#* cached
git://github.com/angular/bower-angular.git#1.4.1
[INFO] bower angular#* validate 1.4.1 against
git://github.com/angular/bower-angular.git#*
[INFO] bower angular#>=1.0.6 cached
git://github.com/angular/bower-angular.git#1.4.1
[INFO] bower angular#>=1.0.6 validate 1.4.1 against
git://github.com/angular/bower-angular.git#>=1.0.6
[INFO] bower angular#~1.x cached
git://github.com/angular/bower-angular.git#1.4.1
[INFO] bower angular#~1.x validate 1.4.1 against
git://github.com/angular/bower-angular.git#~1.x
[INFO] bower angular#1.3.x cached
git://github.com/angular/bower-angular.git#1.3.16
[INFO] bower angular#1.3.x validate 1.3.16 against
git://github.com/angular/bower-angular.git#1.3.x
[ERROR] bower ECONFLICT Unable to find suitable
version for angular
```
Therefore, a lot of users will report building failure into the mailing
list and JIRA.
That's what we went through last time we changed angular version.
Any idea of avoiding it?
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