Error -4006 x 10 + Fatal Error -6041

Hi

I have a Basic MSI Project with multiple languages support.
After building it I get at first "ISDEV : error -4006: Cannot delete file..xxxx.msi" 10 times and then "ISDEV : fatal error -6041: Internal build error".

Yes, I set already "Keep Unused Directories setting" to "Yes" but it has no effect.

I have IS 2014 Premier Edition, but no idea :confused:
Can anyone help?

Thanks.