file INSTALL cannot find "blahblah" FIle exists

CPack: Create package using ZIP
CPack: Install projects
CPack: - Install project: MyProject [Checked]
CPack: -   Install component: MyComponent
CMake Error at D:/builds/blahblah/cmake_install.cmake:4081 (file):
  file INSTALL cannot find
  "D:/builds/blahblah/myfile.xml":
  File exists.
Call Stack (most recent call first):
  D:/builds/blahblah/cmake_install.cmake:182 (include)

Which is it? Can the file not be found? Or does the file exist when it's not supposed to?