Error occurs during Importing keys

Hey all,

Step 1) importing a set of licenses (we have feature fields, but we keep them empty in the importing process, so basically we only import the email address)Step 2) In our application the activation of the license is ok, but reading the feature field, using ta.GetFeatureValue("application_type") gives an error:

Custom UI runtime error; An error occured when called the callback: Getlabel.debugging in the code it looks like it is happening in the function:Public Function GetFeatureValue(ByVal featureName As String, ByVal defaultValue As String) As String

in the line:Select Case If((IntPtr.Size = 8), Native64.TA_GetFeatureValue(handle, featureName, sb, length), Native.TA_GetFeatureValue(handle, featureName, sb, length))

Now I've noticed that, with a manual added productkey, it says "(no value)" at the feature values, while with the imported ones it says nothing.