Umbraco version 7.6.5 assembly: 1.0.6428.37121

Since last week we can't upload new documents in "media". We get an error message when we tried to save any documents which says: and then the save button just is standing still thinking.

"Received an error from the server An error occured One or more errors occurred.

Exception Details System.AggregateException: One or more errors occurred. Stacktrace at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at Umbraco.Web.WebApi.Binders.ContentItemBaseBinder2.BindModel(HttpActionContext actionContext, ModelBindingContext bindingContext) at System.Web.Http.ModelBinding.ModelBinderParameterBinding.ExecuteBindingAsync(ModelMetadataProvider metadataProvider, HttpActionContext actionContext, CancellationToken cancellationToken) at System.Web.Http.Controllers.HttpActionBinding.<ExecuteBindingAsyncCore>d__0.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__2.MoveNext() -- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext() Inner Exception System.AggregateException: One or more errors occurred. at Umbraco.Web.WebApi.Binders.ContentItemBaseBinder2.<>cDisplayClass2.0(Task1 x) at System.Threading.Tasks.Task.Execute() Inner Exception System.IO.IOException: Error writing MIME multipart body part to output stream. at System.Net.Http.HttpContentMultipartExtensions.<MultipartReadAsync>d__8.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Net.Http.HttpContentMultipartExtensions.<ReadAsMultipartAsync>d__01.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Umbraco.Web.WebApi.Binders.ContentItemBaseBinder`2.