When you start an application error occurs and generates the following log:
Zoiper for Windows Phone:1.0.4.4
Device details:
Application Current Memory Usage: 21696512
Application Memory Usage Limit: 0
Application Peak Memory Usage: 21868544
Device Firmware Version: 02540.00019.15053.26003
Device Hardware Version: 2.0.0.3
Device Manufacturer: NOKIA
Device Name: RM-1045_1094
Device Total Memory: 2018398208
Power Source:Battery
HResult: -2147467261
Message: Object reference not set to an instance of an object.
Source: ZoiperVOIPManagers
StackTrace: at ZoiperVOIPManagers.ZoiperContactStore.CreateContactQuery(CreateQueryOptionsFor queryOptions)
at ZoiperVOIPManagers.ZoiperContactStore.GetAllContacts()
at ZoiperVOIP.MainPage..ctor()