My company is using the Sitefinity 8.0.5700.0 Standard Edition for our website -- Every time I try to access "Categories" or even add categories when I'm publishing a list/news item, this message pops up:
Cannot serialize parameter of type 'Telerik.Sitefinity.Web.Services.TaxonomyCollectionContext'(for operation 'GetTaxa', contract 'IHierarchicalTaxonService') because it is not the exact type 'Telerik.Sitefinity.Web.Services.CollectionContext`1[Telerik.Sitefinity.Taxonomies.Web.Services.WcfHierarchicalTaxon]' in the method signature and is not in the known types collecetion. In order to serialize the parameter, add the type of the known types collection for the operation using ServiceKnownTypeAttribute.
When I press okay, the page just keeps on loading, but I never get to access the Categories page. Does anyone know the problem or have any solution? Thanks