Same problem here. I run it manualy and get the following error:
Opened casc storage 'C:/World of Warcraft\Data'
Extracting maps...
Read Map.db2 file...
Failed to open 'DBFilesClient\Map.db2' in CASC storage: FILE_NOT_FOUND
Fatal error: Invalid Map.db2 file format! FILE_NOT_FOUND
I found the file "Map.db2" in C:/WOW/dbc/deDE/
common.dll was new build befor i run it again.