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[protege-discussion] Problem using older projects in Protege 3.4

Tania Tudorache tudorache at
Thu May 21 18:38:17 PDT 2009

I could not reproduce the problem.. It seems like this is a problem 
either with your Protege 3.3.1 installation (maybe a plugin going 
rogue), or your Protege 3.4 installation.

Did you install any additional plugins in P3.3.1 or P3.4?

I did the exact steps you described and did not get the error. It is 
also possible that your ontology has some problem. If you can, please 
send us the ontology, and we can take a look what is going wrong.

We will have Memorial day holiday starting with this Friday and be back 
only on Tuesday next week.


Hanno Wunderlich wrote:
> Hi,
> i am moving my old protege projects to protege 3.4 in order to use the 
> new features (especially these in the server part). But when i load 
> and save one of my old projects with protege 3.4 i get following 
> warnings for all slots and clses:
> WARNING: null type: my_Cls1 -- InstanceStorer.isStorableInstance()
> WARNING: null type: my_Slot1 -- InstanceStorer.isStorableInstance()
> After saving all the class-instances were removed from the 
> :STANDARD-CLASS as well as the slot-instance from the :STANDARD-SLOT.
> But when i restart protege with the saved project the clses and slots 
> are there again (and the warnings occur again when saving).
> The Problem can be reproduced as follows:
> - create a new project with protege 3.3.1
> - create a new cls a in the project
> - create a new slot b in the project
> - save the project
> - load the project in protege 3.4
> - save the project
> You will get:
> WARNING: null type: a -- InstanceStorer.isStorableInstance()
> WARNING: null type: b -- InstanceStorer.isStorableInstance()
> Is there any way to correct the project so that protege 3.4 will not 
> post the warnings?
> Thanks
> Hanno
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