请问各位大侠这是甚么意思?Deleting intermediate files and output files fo

请问各位大侠这是甚么意思?
Deleting intermediate files and output files for project 'aaa - Win32 Debug'.
--------------------Configuration: aaa - Win32 Debug--------------------
Compiling...
aaa.cpp
Linking...
LINK : fatal error LNK1104: cannot open file "Debug/aaa.exe"
Error executing link.exe.
aaa.exe - 1 error(s), 0 warning(s)