After updating to unity 5.6, i'm unable to load Fabric. When performing the API update, the API updater fails. After investigation, the issues went away after removing Crashlytics / Fabric.
After installing the unity package from the fabric site, the API updater fails with this cryptic message:
System.InvalidOperationException: Sequence contains more than one element
at System.Linq.Enumerable.SingleOrDefault[TSource] (System.Collections.Generic.IEnumerable`1[T] source) [0x000a3] in <776c86d7978548379a28dce0f5e4ccbb>:0
If I cancel the api updater, I get the following deprecation warnings from unity:
Assets/Fabric/Editor/GUI/Controller/PluginController.cs(58,45): error CS0619: `UnityEditor.PlayerSettings.bundleIdentifier' is obsolete: `Use PlayerSettings.applicationIdentifier instead (UnityUpgradable) -> UnityEditor.PlayerSettings.applicationIdentifier'
Assets/Fabric/Editor/Postbuild/FabricBuildEventAndroid.cs(36,34): error CS0619: `UnityEditor.PlayerSettings.bundleIdentifier' is obsolete: `Use PlayerSettings.applicationIdentifier instead (UnityUpgradable) -> UnityEditor.PlayerSettings.applicationIdentifier'
Assets/Fabric/Editor/Prebuild/AndroidBuildPropertiesManager.cs(30,38): error CS0619: `UnityEditor.PlayerSettings.bundleIdentifier' is obsolete: `Use PlayerSettings.applicationIdentifier instead (UnityUpgradable) -> UnityEditor.PlayerSettings.applicationIdentifier'
Even if I sort these deprecations out manually, I'm still unable to run fabric. It seems also i'm not the only experiencing this issue, see this link from twittercommunity
Thanks
I have removed the Fabric settings asset file from the "Editor Default Resources" folder and after fixing the deprecation issues (manually) i was able to finally launch fabric and download the crashlytics kit.