Query Builder Error in CRM 2011

hi,

We are trying to save the records of the entity and we are getting the below Query Builder error even we have admin rights.

Below are the exceptions details,

Exception information:

   Exception type: EntityMetadataNotFoundException

   Exception message: The entity with a name = 'new_call' was not found in the MetadataCache.

  at Microsoft.Crm.Metadata.DynamicMetadataCache.GetEntity(String entityName, NameMappingType mapping)

  at Microsoft.Crm.Web.MainPage.get_CurrentEntity()

  at Microsoft.Crm.Web.MainPage.SetContentUrl()

  at Microsoft.Crm.Web.MainPage.ConfigurePage()

  at Microsoft.Crm.Application.Controls.PageManager.OnPreRender(EventArgs e)

  at System.Web.UI.Control.PreRenderRecursiveInternal()

  at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Please reply the solution or hint how to fix this error.