I'm getting the following error when starting up my Umbraco site, does anyone have any pointers in where to look?

System.InvalidOperationException: No data for media 1120
   at Umbraco.Cms.Infrastructure.PublishedCache.Persistence.NuCacheContentRepository.CreateMediaNodeKit(ContentSourceDto dto, IContentCacheDataSerializer serializer)
   at Umbraco.Cms.Infrastructure.PublishedCache.Persistence.NuCacheContentRepository.GetAllMediaSources()+MoveNext()
   at Umbraco.Extensions.EnumerableExtensions.InGroupsOf[T](IEnumerable`1 source, Int32 groupSize)+MoveNext()
   at Umbraco.Cms.Infrastructure.PublishedCache.ContentStore.SetAllFastSortedLocked(IEnumerable`1 kits, Int32 kitGroupSize, Boolean fromDb)

First thing you could try is to delete the nucache. Inside your project root, there is an Umbraco folder and inside there is a data folder and then a TEMP folder. You can try deleting the TEMP folder.

I've had a look, but it doesn't seem that the NuCache file exists.