Application output

Xamarin.iOS: USING STAGING SERVER FOR ACTIVATION
Please ensure your device is connected...
Connected to: iPad
warning MT1003: Could not kill the application 'com.your-company.GenericsIssueApp1'. You may have to kill the application manually.
warning MT1108: Could not find developer tools for this 8.4 (12H143) device. Please ensure you are using a compatible Xcode version and then connect this device to Xcode to install the development support files.
error MT1007: Failed to launch the application 'com.your-company.GenericsIssueApp1' on the device 'iPad': Look for earlier warnings returned: 0x454. You can still launch the application manually by tapping on it.
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/DF7C5243-F8E1-4D5D-BBB1-A622E113652E/GenericsIssueApp1.app/.monotouch-32/Xamarin.iOS.dll
Thread started: Finalizer #2
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/DF7C5243-F8E1-4D5D-BBB1-A622E113652E/GenericsIssueApp1.app/.monotouch-32/System.Core.dll
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/DF7C5243-F8E1-4D5D-BBB1-A622E113652E/GenericsIssueApp1.app/.monotouch-32/GenericsIssueApp1.exe
2015-08-12 16:11:47.102 GenericsIssueApp1[177:4379] System.NullReferenceException: Object reference not set to an instance of an object
  at System.Collections.Generic.KeyValuePair`2[System.Int64,System.Collections.Generic.IList`1[System.Nullable`1[System.Double]]].get_Key () [0x00000] in /Users/builder/data/lanes/1977/7e598ef6/source/mono/external/referencesource/mscorlib/system/collections/generic/keyvaluepair.cs:36 
  at (wrapper unknown) object:gsharedvt_out ()
  at GenericsIssueApp1.RootViewController.<ConvertDictionary`1>m__0[Nullable`1] (KeyValuePair`2 pair) [0x00002] in /Users/xamarin76/Downloads/PossibleGenericsIssue/GenericsIssueApp1/RootViewController.cs:57 
  at (wrapper delegate-invoke) System.Func`2<System.Collections.Generic.KeyValuePair`2<long, System.Collections.Generic.IList`1<System.Nullable`1<double>>>, long>:invoke_TResult_T (System.Collections.Generic.KeyValuePair`2<long, System.Collections.Generic.IList`1<System.Nullable`1<double>>>)
  at System.Linq.Enumerable.ToDictionary[KeyValuePair`2,Int64,Nullable`1] (IEnumerable`1 source, System.Func`2 keySelector, System.Func`2 elementSelector, IEqualityComparer`1 comparer) [0x0002f] in //Library/Frameworks/Xamarin.iOS.framework/Versions/8.10.4.49/src/mono/mcs/class/System.Core/System.Linq/Enumerable.cs:2924 
  at System.Linq.Enumerable.ToDictionary[KeyValuePair`2,Int64,Nullable`1] (IEnumerable`1 source, System.Func`2 keySelector, System.Func`2 elementSelector) [0x00000] in //Library/Frameworks/Xamarin.iOS.framework/Versions/8.10.4.49/src/mono/mcs/class/System.Core/System.Linq/Enumerable.cs:2911 
  at GenericsIssueApp1.RootViewController.ConvertDictionary[Nullable`1] (System.Collections.Generic.Dictionary`2 source) [0x0001a] in /Users/xamarin76/Downloads/PossibleGenericsIssue/GenericsIssueApp1/RootViewController.cs:57 
  at GenericsIssueApp1.RootViewController.ViewDidLoad () [0x00058] in /Users/xamarin76/Downloads/PossibleGenericsIssue/GenericsIssueApp1/RootViewController.cs:44