Icons are not showing after upgrading ionic. Why?

After upgrading to latest ionic, icons are not showing. Why am i getting that error ?

Any help would be appreciated.

It could be to do with the icons you were using, much has changed as the Ionic upgrade also updated to use the latest ionicons. Check over at http://ionicons.com

Yes, this is quite strange they didn’t document these breaking changes… most common changes were “ios7” --> “ios”, and the animated icons are out.