Error 'Append' is not a member of 'System.Array'


I tested the project shared:

it is showing the same error here also …

I see. Could you tell us more about your Windows version? Maybe some libraries are not present and have to be installed.

See here:

Thanks for response…
I am working on Windows Server 2012 R2 and got it checked that Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019 x86 is present already

the .net installation would be important to be checked as well

@ppr I crosschecked the .net installation framework it has both 3.5 and 4.5.

Version 4.6.1 is a good match:

can you cross check if there is a difference between the two machines?

@ppr Thanks for your response
I checked the versions on both machines where

Local machine has version:


And VM Machine has


Does the same happen on both machines above? I checked and for me it works with NET Framework version:

We really want to resolve this issue because we struggle to reproduce it on our end.

May we ask you addtionally to show us / share with us a screenshot or feedback on the list of all imported namespaces. Was this XAML involved in any Extract Workflow step?

Thanks for response
@ppr @loginerror
Should i update the .Net Framework on my Virtual Machine ?


The above screenshots contains the list of all imported namespaces.
This XAML is not involved in any Extract Workflow step.

thank you for the list. It looks good so far on the first look.

In my opinion yes, But lets wait also for the feedback from Maciej / Pablito

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Given that this issue is proving hard to debug, we would appreciate if that was something you could look into.

Based on the two screenshots above, if the machine that has the version 4.8 does not have this error and the one with 4.6 does, it has high chance of fixing it.

@loginerror @ppr

The error got resolved once i updated the version of .Net Framework on VM machine to 4.8 …

Thanks a lot for all the responses…

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Thank you for confirming, much appreciated :slight_smile:

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