Bastian,Does it not appear in the deployment log file? There is a more detailed log of the error and you can generally determine where it failed by looking at the log. The log file will be named the same as the package file with a Results.log after it:
MyPackageFile_Results.log
I agree that you can never have enough information when trying to work through a problem so adding as much information to the log file as we can is always a good idea. I will look into the log file and see if we can add any more information that is currently being omitted.