fail to create dir

My app is running since two years on a hundred devices and suddenly I have problems creating a directory.
I don't know if it is related to Android 6 or the latest B4A updates.
This is the code

Code:

  Dim AppPath As String=File.DirRootExternal & "/test"
If File.exists("",AppPath)=False Then
Log("creating apppath")
File.MakeDir("",AppPath)
End If
If File.exists("",AppPath)=False Then Log("dir not exists")  

The code is executed in the StarterService and I have the log "dir...

fail to create dir

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