Ios icon can't be used

ionic-v1
1
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code above is a situation like thisimage

so what’s wrong with icon ion-ios-play-outline? i’ve tried a lot “right” type of"ios icon" on http://ionicons.com/ such asimage

how to resolve this problem？

2

Got an old version? Try “ion-ios7-play-outline”

3

fantastic！thx a lot！