When I try to use items from Data Sources.

This is the error details:

One or more errors encountered while loading the designer. The errors are
listed below. Some errors can be fixed by rebuilding your project, while
others may require code changes.

Key not valid for use in specified state.
Hide    

at Microsoft.VisualStudio.Data.DataProtection.DecryptString(String s)
at
Microsoft.VSDesigner.VSDesignerPackage.AppSettingsHelper.AddServerExplorerConnections(IServiceProvider serviceProvider, IList connections)
at
Microsoft.VSDesigner.VSDesignerPackage.GlobalConnectionService.Microsoft.VSDesigner.VSDesignerPackage.IGlobalConnectionService.GetConnections(IServiceProvider serviceProvider, Project project)
at
Microsoft.VSDesigner.DataSource.DesignConnection.GetConnectionFromAppSettings(String objectName, String propertyName)
at
Microsoft.VSDesigner.DataSource.DesignConnection.get_ConnectionStringObject()
at Microsoft.VSDesigner.DataSource.DbSource.set_Connection(IDesignConnection
value)
at
Microsoft.VSDesigner.DataSource.DesignDataSource.SetConnectionProperty(Source
source)
at
Microsoft.VSDesigner.DataSource.DesignDataSource.ReadXmlSchema(DataSourceXmlTextReader xmlReader)
at Microsoft.VSDesigner.DataSource.DesignDataSource.ReadXmlSchema(TextReader
textReader)
at
Microsoft.VSDesigner.DataSource.Designer.DataSourceSerializationService.DeserializeToDataSource(String filePath, Object serializationData)
at
Microsoft.VSDesigner.DataSource.ProjectDataSourceDescriptor.LoadDataSource()
at
Microsoft.VSDesigner.DataSource.ProjectDataSourceDescriptor.Init(IServiceProvider
provider, IVsHierarchy primaryHierarchy, UInt32 primaryItemId, Object
primaryDocDataObject, UInt32 docCookie, IVsInvisibleEditor invisibleEditor,
IDesignerHost host)
at
Microsoft.VSDesigner.DataSource.ProjectDataSourceStorage.EnsureInvisibleEditor(ProjectItem
dsProjectItem, Boolean ensureWritable, Boolean createInvisibleEditor)
at
Microsoft.VSDesigner.DataSource.ProjectDataSourceStorage.GetDataSourceInternal(Object
caller, ProjectItem dsProjectItem, Boolean ensureWritable, Boolean
createInvisibleEditor)
at
Microsoft.VSDesigner.DataSource.Designer.DataSourceDesignerLoader.HandleLoad(IDesignerSerializationManager serializationManager)