I am also getting this issue. Here is my compile output. Please help me to fix this issue.

20:47:28: Running steps for project qtservice... 20:47:28: Configuration unchanged, skipping qmake step. 20:47:28: Starting: "C:\Qt\qtcreator-4.6.0-rc1\bin\jom.exe" cd examples\ && ( if not exist Makefile E:\C_Drive\QT5.15.2\5.15.2\msvc2015_64\bin\qmake.exe -o Makefile "D:\Work\Work_Qt_old\Qt-116\Qt116 Service\qtservice\examples\exam ples.pro" -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug" ) && C:\Qt\qtcreator-4.6.0-rc1\bin\jom.exe -f Makefile cd interactive\ && ( if not exist Makefile E:\C_Drive\QT5.15.2\5.15.2\msvc2015_64\bin\qmake.exe -o Makefile "D:\Work\Work_Qt_old\Qt-116\Qt116 Service\qtservice\examples\interactive\interactive.pro" -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug" ) && C:\Qt\qtcreator-4.6.0-rc1\bin\jom.exe -f Makefile C:\Qt\qtcreator-4.6.0-rc1\bin\jom.exe -f Makefile.Debug link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /SUBSYSTEM:CONSOLE "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /MANIFEST:embed /OUT:debug\interactive.exe @C:\Users\Sikander_PC\AppData\Local\Temp\interactive.exe.748.0.jom LINK : fatal error LNK1181: cannot open input file 'debug\main.obj' jom: D:\Qt_builds\qtservice-Debug\examples\interactive\Makefile.Debug [debug\interactive.exe] Error 1181 jom: D:\Qt_builds\qtservice-Debug\examples\interactive\Makefile [debug] Error 2 jom: D:\Qt_builds\qtservice-Debug\examples\Makefile [sub-interactive-make_first] Error 2 cd server\ && ( if not exist Makefile E:\C_Drive\QT5.15.2\5.15.2\msvc2015_64\bin\qmake.exe -o Makefile "D:\Work\Work_Qt_old\Qt-116\Qt116 Service\qtservice\examples\server\server.pro" -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug" ) && C:\Qt\qtcreator-4.6.0-rc1\bin\jom.exe -f Makefile C:\Qt\qtcreator-4.6.0-rc1\bin\jom.exe -f Makefile.Debug link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /SUBSYSTEM:CONSOLE "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /MANIFEST:embed /OUT:debug\httpservice.exe @C:\Users\Sikander_PC\AppData\Local\Temp\httpservice.exe.8736.15.jom cd controller\ && ( if not exist Makefile E:\C_Drive\QT5.15.2\5.15.2\msvc2015_64\bin\qmake.exe -o Makefile "D:\Work\Work_Qt_old\Qt-116\Qt116 Service\qtservice\examples\controller\controller.pro" -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug" ) && C:\Qt\qtcreator-4.6.0-rc1\bin\jom.exe -f Makefile C:\Qt\qtcreator-4.6.0-rc1\bin\jom.exe -f Makefile.Debug link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /SUBSYSTEM:CONSOLE "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /MANIFEST:embed /OUT:debug\controller.exe @C:\Users\Sikander_PC\AppData\Local\Temp\controller.exe.9244.15.jom LINK : fatal error LNK1181: cannot open input file 'debug\main.obj' jom: D:\Qt_builds\qtservice-Debug\examples\server\Makefile.Debug [debug\httpservice.exe] Error 1181 jom: D:\Qt_builds\qtservice-Debug\examples\server\Makefile [debug] Error 2 LINK : fatal error LNK1181: cannot open input file 'debug\main.obj' jom: D:\Qt_builds\qtservice-Debug\examples\controller\Makefile.Debug [debug\controller.exe] Error 1181 jom: D:\Qt_builds\qtservice-Debug\examples\Makefile [sub-server-make_first] Error 2 jom: D:\Qt_builds\qtservice-Debug\examples\controller\Makefile [debug] Error 2 jom: D:\Qt_builds\qtservice-Debug\examples\Makefile [sub-controller-make_first] Error 2 jom: D:\Qt_builds\qtservice-Debug\Makefile [sub-examples-make_first-ordered] Error 2 20:47:29: The process "C:\Qt\qtcreator-4.6.0-rc1\bin\jom.exe" exited with code 2. Error while building/deploying project qtservice (kit: QT5.15.2MSVC15_64) When executing step "Make" 20:47:29: Elapsed time: 00:00.