Problema ao clicar em Buscar

[Laerton2016]

O aplicativo apresenta erro InspectorDebugSession(0): HandleTargetEvent: ThreadStarted
09-16 22:38:50.472 D/Mono (11436): [0x9e2fd930] hill climbing, change max number of threads 5
09-16 22:38:50.748 D/Mono (11436): DllImport attempting to load: '__Internal'.
09-16 22:38:50.748 D/Mono (11436): DllImport loaded library '(null)'.
09-16 22:38:50.748 D/Mono (11436): DllImport searching in: '__Internal' ('(null)').
09-16 22:38:50.748 D/Mono (11436): Searching for 'monodroid_get_system_property'.
09-16 22:38:50.748 D/Mono (11436): Probing 'monodroid_get_system_property'.
09-16 22:38:50.749 D/Mono (11436): Found as 'monodroid_get_system_property'.
09-16 22:38:50.749 D/Mono (11436): DllImport searching in: '__Internal' ('(null)').
09-16 22:38:50.749 D/Mono (11436): Searching for 'monodroid_free'.
09-16 22:38:50.749 D/Mono (11436): Probing 'monodroid_free'.
09-16 22:38:50.749 D/Mono (11436): Found as 'monodroid_free'.
An unhandled exception occured.
InspectorDebugSession(0): HandleTargetEvent: UnhandledException
09-16 22:38:57.739 D/Mono (11436): [0x9e2fd930] worker finishing
Thread finished: #6