paper2D game crashes on launch or as package - iOS - 'Falied to Load Outer for resource 'WidgetTree"

My Paper2D game crashes on launch or as package on iOS (iPad Mini and iPod Touch) - 'Falied to Load Outer for resource 'WidgetTree"

It works on Android.

The above error repeats multiple times at the end of the log I pulled from iPad Mini, which I suppose means that is when the crash is happening:

[2016.05.10-21.15.48:948] 0]LogLinker:Warning: CreateImport: Failed to load Outer for resource ‘WidgetTree’: WidgetBlueprint /Script/UMGEditor.Default__WidgetBlueprint
[2016.05.10-21.15.49:029] 0]LogLinker:Warning: CreateImport: Failed to load Outer for resource ‘WidgetTree’: WidgetBlueprint /Script/UMGEditor.Default__WidgetBlueprint
[2016.05.10-21.15.49:084] 0]LogLinker:Warning: CreateImport: Failed to load Outer for resource ‘WidgetTree’: WidgetBlueprint /Script/UMGEditor.Default__WidgetBlueprint
[2016.05.10-21.15.49:126] 0]LogLinker:Warning: CreateImport: Failed to load Outer for resource ‘WidgetTree’: WidgetBlueprint /Script/UMGEditor.Default__WidgetBlueprint
[2016.05.10-21.15.49:129] 0]LogLinker:Warning: CreateImport: Failed to load Outer for resource ‘WidgetTree’: WidgetBlueprint /Script/UMGEditor.Default__WidgetBlueprint
[2016.05.10-21.15.49:132] 0]LogLinker:Warning: CreateImport: Failed to load Outer for resource ‘WidgetTree’: WidgetBlueprint /Script/UMGEditor.Default__WidgetBlueprint
[2016.05.10-21.15.49:376] 0]LogLinker:Warning: CreateImport: Failed to load Outer for resource ‘WidgetTree’: WidgetBlueprint /Script/UMGEditor.Default__WidgetBlueprint
2016.05.10-21.15.4

I also have a bug report in about a material that crashes when I try to edit it. It fails to compile, saying it has an incompatible node. From my Launch on iOS Output log:
“LogMaterial: Missing cached shader map for material PreviewShadowIndicatorMaterial, compiling. LogMaterial:Warning: Failed to compile Material /Engine/EditorMaterials/PreviewShadowIndicatorMaterial.PreviewShadowIndicatorMaterial for platform GLSL_ES2_IOS, Default Material will be used in game. LogMaterial:Warning: (Node TextureSample) Node not supported in feature level ES2”