hi
I'm using Kentico 5.5.
Getting ready for the new site (template)
Step 5 Import progress
Objects are being imported.
I get error code.

please help me

code as

ERROR: Error importing document ''
Message: [TreeNode.NewInstance]: Class name CMS.MenuItem not defined! Stack Trace: at CMS.TreeEngine.TreeNode.NewInstanceFromDataRow(DataRow dataRow, String className, TreeProvider existingTreeProvider)
at CMS.TreeEngine.TreeNode..ctor(DataRow dataRow, String className, TreeProvider treeProvider)
at CMS.CMSImportExport.ImportProvider.ImportDocuments(SiteImportSettings settings, TranslationHelper th)

ERROR: Error importing documents
Message: [TreeNode.NewInstance]: Class name CMS.MenuItem not defined! Stack Trace: at CMS.CMSImportExport.ImportProvider.ImportDocuments(SiteImportSettings settings, TranslationHelper th)
at CMS.CMSImportExport.ImportProvider.ImportDocumentsData(SiteImportSettings settings, TranslationHelper th)