No registered handler for URL scheme geo

Hi all, I have an APP where I need to open google maps where user click a button/link. This is the code:

<a class=“block-v” href=“geo:{{::item.lat}},{{::item.lon}}”><span class=“min” ng-hide="!item.address"> Mappa</span></a>

Under Android there is no problem, but under iOS I see this error in console log:

"LaunchServices: ERROR: There is no registered handler for URL scheme geo".

I have searched on Google and I have found a solution that does not work: add this code to .plist file:

<key>LSApplicationQueriesSchemes</key>
<array>
<string>geo
</array>

Where is my error ? Thanks.