[lively-kernel] ObjectGraphLinearizer is trying to deserializer instance of lively.Presentation.PageMorph but this class cannot be found

Robert Krahn robert.krahn at gmail.com
Fri Sep 7 08:58:29 CEST 2012

This message appears because one object that you wanted to load is an
of a class defined in a module that could not be loaded. In particular the
core repository does not include the module lively.Presentation (because we
not consider this as part of the core). So this is not a problem with your
installation but you could consider it as conceptional issue of using a
"remote" PartsBin, or, going one step farther of differentiating between
"objects" and "source code" at all.

This issue didn't came up until now because usage of the PartsBin only
happened from within the Webwerkstatt environment where all dependencies are

To solve this problem for now you can

1. Work in the online wiki http://lively-kernel.org/repository/webwerkstatt/


2. Create a working copy of webwerkstatt locally using "lk workspace
--checkout-ww" and then start the server with "lk server --lk-dir `lk
scripts-dir`/workspace/ww" (all lk-scripts commands are documented here:
This gives you a complete copy of webwerkstatt.


3. Manually copy the required modules into "`lk scripts-dir`/workspace/lk"

Since we want to go towards a model of distributed Lively installations that
share object repositories like Webwerkstatt's PartsBin (as opposed to just
have the Webwerkstatt) we will work on a better and more general solution
that problem. As of now I can just offer you the solutions above.

Hope that helps,

On Thu, Sep 6, 2012 at 9:13 AM, Andy Burnett <
andy.burnett at knowinnovation.com> wrote:

> Hello
> I am playing around with the parts in the PartsBin - on my own server -
> and get this error message. The version of the lively-kernel server does
> work. So, am I missing something from my copy of the PartsBin (seems
> likely), or is there an add-on to the server that I don't have in my
> environment?
> And, related to the first question, how do I keep my copy of the PartsBin
> up to date? is there an svn update built into the server?
> Cheers
> Andy
> _______________________________________________
> lively-kernel mailing list
> lively-kernel at hpi.uni-potsdam.de
> http://lists.hpi.uni-potsdam.de/listinfo/lively-kernel
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