^CMake Error at FileSetDefaultWrongType\.cmake:[0-9]+ \(target_sources\):
  target_sources FILE_SET names starting with a capital letter are reserved
  for built-in file sets and may only be "HEADERS", "SOURCES", "CXX_MODULES"
Call Stack \(most recent call first\):
  CMakeLists\.txt:[0-9]+ \(include\)$
