Fehler im AVR Studio 5

Hallo, wenn ich das assemblieren will:

.include "tn13def.inc"
main:
rjmp main

kriege ich diesen Fehler:

Error  1  The "RunAssemblerTask" task failed unexpectedly.
System.ApplicationException: Error in the application.
   at 
System.Threading.ThreadPool.RegisterWaitForSingleObjectNative(WaitHandle 
waitHandle, Object state, UInt32 timeOutInterval, Boolean 
executeOnlyOnce, RegisteredWaitHandle registeredWaitHandle, 
StackCrawlMark& stackMark, Boolean compressStack)
   at System.Threading.ThreadPool.RegisterWaitForSingleObject(WaitHandle 
waitObject, WaitOrTimerCallback callBack, Object state, UInt32 
millisecondsTimeOutInterval, Boolean executeOnlyOnce, StackCrawlMark& 
stackMark, Boolean compressStack)
   at System.Threading.ThreadPool.RegisterWaitForSingleObject(WaitHandle 
waitObject, WaitOrTimerCallback callBack, Object state, Int32 
millisecondsTimeOutInterval, Boolean executeOnlyOnce)
   at System.Diagnostics.Process.EnsureWatchingForExit()
   at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo 
startInfo)
   at System.Diagnostics.Process.Start()
   at Microsoft.Build.Utilities.ToolTask.ExecuteTool(String pathToTool, 
String responseFileCommands, String commandLineCommands)
   at Microsoft.Build.Utilities.ToolTask.Execute()
   at 
Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskE 
xecutionHost.Execute()
   at 
Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecuti 
onHost  taskExecutionHost, TaskLoggingContext taskLoggingContext, 
TaskHost taskHost, ItemBucket bucket, TaskExecutionMode 
howToExecuteTask, Boolean& taskResult)  C:\Programme\Atmel\AVR Studio 
5.1\Vs\Assembler.targets  4  5  bldc


was ist da los?