Hi Richard,

I can now confirm that the error is the same whether I use an existing 
project, create a new project and use existing ontologies, or create a new 
project and create a new RDF file with the default settings. They all lead 
to the same error with the class view. I can also confirm that the 
Properties View does not work and causes the same type of error.

Cheers,




On Tuesday, 26 July 2016 09:04:35 UTC+1, Richard Cyganiak wrote:
>
> Hi xerao,
>
> Does this only affect the Classes view on the left, or do you get the same 
> kind of errors in the Properties view on the right?
>
> Are you working on a project created in a previous/different version of 
> TBC? Or is this a fresh project but you imported existing RDF/OWL files 
> into it?
>
> If you select your project and do:
>
>     File > New > RDF File
>
> and confirm the default settings, do you get the same errors in the new 
> file?
>
> Richard
>
>
>
> On 25 Jul 2016, at 12:35, xerao <[email protected] <javascript:>> 
> wrote:
>
> I am trying to run: TopBraid Composer Free Edition v5.1.4.v201606   on 
> Ubuntu Linux 16.x with Java 8 installed. 
>
> I cannot double click on any of the classes, or create subclasses etc and 
> clicking on the "add" button for creating a subclass does not do anything.  
> I get the following errors in the console.
>
> *** BUG ***
> In pixman_region32_init_rect: Invalid rectangle passed
> Set a breakpoint on '_pixman_log_error' to debug
>
> *** BUG ***
> In pixman_region32_init_rect: Invalid rectangle passed
> Set a breakpoint on '_pixman_log_error' to debug
>
> [TopBraid Error] 2016-07-25T11:42:36+0100 - org.topbraidcomposer.core: 
> Failed to execute operation (null)
> java.lang.reflect.InvocationTargetException
>     at 
> org.topbraid.core.change.AbstractChangeEngine.execute(AbstractChangeEngine.java:286)
>     at 
> org.topbraidcomposer.core.change.TBCChangeEngine.access$0(TBCChangeEngine.java:1)
>     at 
> org.topbraidcomposer.core.change.TBCChangeEngine$2.run(TBCChangeEngine.java:155)
>     at 
> org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:119)
> Caused by: org.eclipse.core.commands.ExecutionException: While executing 
> the operation, an exception occurred
>     at 
> org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:524)
>     at 
> org.topbraid.core.change.AbstractChangeEngine.execute(AbstractChangeEngine.java:272)
>     ... 3 more
> Caused by: java.lang.NullPointerException
>     at 
> org.topbraidcomposer.navigation.subclassestree.createclasses.CreateClassesDialog$1.execute(CreateClassesDialog.java:125)
>     at 
> org.topbraid.core.change.ChangeOperation.execute(ChangeOperation.java:105)
>     at 
> org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:516)
>     ... 4 more
>
>
> Any way to resolve this problem?
>
> Cheers
>
>
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