Hello. I just added a composition to my Home node, and now my umbraco installation is throwing errors left and right.

I cant access any pages withing Umbraco, and when visit the Setting > Published Status its greyed out and throws an error

Server error: Contact administrator, see log for full details. Failed to verify the cache.

In my log i now have 1 error and 1 Fatal.

System.IO.IOException: The process cannot access the file 'C:\www\responsgo.dk\umbraco\Data\TEMP\NuCache\NuCache.Content.db' because it is being used by another process.
   at Microsoft.Win32.SafeHandles.SafeFileHandle.CreateFile(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options)
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
   at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
   at CSharpTest.Net.IO.TransactedCompoundFile..ctor(Options options)
   at CSharpTest.Net.Storage.BTreeFileStoreV2..ctor(Options options)
   at CSharpTest.Net.Collections.BPlusTree`2.OptionsV2.CreateStorage()
   at CSharpTest.Net.Collections.BPlusTree`2.NodeCacheBase..ctor(BPlusTreeOptions`2 options)
   at CSharpTest.Net.Collections.BPlusTree`2.NodeCacheNone..ctor(BPlusTreeOptions`2 options)
   at CSharpTest.Net.Collections.BPlusTree`2..ctor(BPlusTreeOptions`2 ioptions)
   at Umbraco.Cms.Infrastructure.PublishedCache.DataSource.BTree.GetTree(String filepath, Boolean exists, NuCacheSettings settings, ContentDataSerializer contentDataSerializer)
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.MainDomRegister()
   at Umbraco.Cms.Core.Runtime.MainDom.Register(Action install, Action release, Int32 weight)
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.<EnsureCaches>b__52_0()
   at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.EnsureCaches()
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.CreatePublishedSnapshot(String previewToken)
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at Umbraco.Cms.Web.Common.UmbracoContext.UmbracoContext.get_Content()
   at Umbraco.Cms.Core.Routing.UrlProvider.GetDocument(Int32 id)
   at Umbraco.Cms.Core.Routing.UrlProvider.GetUrl(Int32 id, UrlMode mode, String culture, Uri current)
   at Umbraco.Extensions.UrlProviderExtensions.GetContentUrlsByCultureAsync(IContent content, IEnumerable`1 cultures, IPublishedRouter publishedRouter, IUmbracoContext umbracoContext, IContentService contentService, ILocalizedTextService textService, IVariationContextAccessor variationContextAccessor, ILogger logger, UriUtility uriUtility, IPublishedUrlProvider publishedUrlProvider)

And

System.InvalidOperationException: No data for media 1280
   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)
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.LoadMediaFromDatabaseLocked(Boolean onStartup)
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.<EnsureCaches>b__52_4()
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.LockAndLoadMedia(Func`1 action)
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.<EnsureCaches>b__52_0()
   at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)
   at System.Threading.LazyInitializer.EnsureInitialized[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.EnsureCaches()
   at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.CreatePublishedSnapshot(String previewToken)
   at Umbraco.Cms.Web.Common.UmbracoContext.UmbracoContext.<>c__DisplayClass11_0.<.ctor>b__0()
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at Umbraco.Cms.Web.Common.UmbracoContext.UmbracoContext.get_PublishedSnapshot()
   at Umbraco.Cms.Web.Common.UmbracoContext.UmbracoContext.get_Content()
   at Umbraco.Cms.Web.Website.Routing.UmbracoRouteValueTransformer.TransformAsync(HttpContext httpContext, RouteValueDictionary values)