Compilation fails at UE4Editor-VSAccessor.dll?

Hello,

after a long time editor compilation failed with the following message:

1>     Creating library C:\UE4\ue401\Engine\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-DerivedDataCache.lib and object C:\UE4\ue401\Engine\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-DerivedDataCache.exp
 1>  -------- End Detailed Actions Stats -----------------------------------------------------------
 1>ERROR : UBT error : Failed to produce item: C:\UE4\ue401\Engine\Binaries\Win64\UE4Editor-VSAccessor.dll
 1>  Cumulative action seconds (4 processors): 0,00 building projects, 5285,53 compiling, 0,00 creating app bundles, 0,00 generating debug info, 878,57 linking, 0,00 other
 1>  UBT execution time: 3311,49 seconds

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1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.MakeFile.Targets(38,5): error MSB3073: The command “…..\Build\BatchFiles\Build.bat UE4Editor Win64 Development” exited with code -1.
========== Build: 0 succeeded, 1 failed, 1 up-to-date, 0 skipped ==========

any suggestion?

thanks