Hi Recep,
This bug is fixed in SP2.
Also this error most propbobly is caused by duplicated CmsToolboxItems somewhere in your site. Please note that these items could be declared in different modules or in the web.config, i.e:
Module 1:
...
new CmsToolboxItem("~/Jobs/JobList.ascx", "Jobs", "Job List", "Displays and manages jobs.")
...
Module2:
...
new CmsToolboxItem("~/Jobs/JobList.ascx", "Jobs", "Job List", "Displays and manages jobs.")
...
or in the web.config:
<telerik>
<cms>
<toolboxControls>
<add name="Job List" section="Jobs" url="~/Jobs/JobList.ascx" description="Displays and manages jobs." />
Please check this out.
All the best,
Vlad
the
telerik team