mohon bantuannya, ada yg tahu saat menjalankan fungsi pada VB.Net 2010

Public Declare Function GetPrivateProfileString Lib "kernel32" Alias 
"GetPrivateProfileStringA" (ByVal lpApplicationName As String, ByVal lpKeyName 
As Object, ByVal lpDefault As String, ByVal lpReturnedString As String, ByVal 
nSize As Integer, ByVal lpFileName As String) As Integer

dengan cara pemanggilan :
Dim nReadLength As Integer
item = Space(256)
nReadLength = GetPrivateProfileString(section, key, "", item, Len(item), 
FileName)

selalu terjadi error :
System.AccessViolationException was unhandled
Message=Attempted to read or write protected memory. This is often an 
indication that other memory is corrupt.

ada yang pernah menggalami nya? harus bagaimana yah untuk solusi nya?
Mohon bantuan teman2. Terima kasih



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