hiiiii i got 85 error when bulid on vs 2015 how to fix these error help me Severity Code Description Project File Line Suppression State Error MSB4057 The target "v8:Rebuild" does not exist in the project. [C:\FS_GIT\libs\v8-5.6.326\src\v8.sln] libv8 C:\FS_GIT\libs\v8-5.6.326\src\v8.sln.metaproj 1 Error C1001 An internal error has occurred in the compiler. libteletone C:\FS_GIT\libs\libteletone\src\libteletone_generate.h 116 Error C1001 An internal error has occurred in the compiler. libpng C:\FS_GIT\libs\win32\libpng\LINK 1 Error LNK1000 Internal error during IMAGE::Pass1 libpng C:\FS_GIT\libs\win32\libpng\Win32\Debug\png.obj 1 Error MSB4057 The target "v8:Rebuild" does not exist in the project. [C:\FS_GIT\libs\v8-5.6.326\src\v8.sln] libv8 C:\FS_GIT\libs\v8-5.6.326\src\v8.sln.metaproj 1 Error MSB3721 The command "C:\FS_GIT\libs\vsyasm.exe -Xvc -f Win32 -i "C:\FS_GIT\libs\libx264\common\x86" -d "PREFIX" -d "STACK_ALIGNMENT=4" -d "HIGH_BIT_DEPTH=0" -d "BIT_DEPTH=8" -d "WIN32=1" -d "ARCH_X86_64=0" -o "Win32\Debug\\" -rnasm -pnasm "..\..\libx264\common\x86\bitstream-a.asm" "..\..\libx264\common\x86\cabac-a.asm" "..\..\libx264\common\x86\const-a.asm" "..\..\libx264\common\x86\cpu-a.asm" "..\..\libx264\common\x86\dct-32.asm" "..\..\libx264\common\x86\dct-a.asm" "..\..\libx264\common\x86\deblock-a.asm" "..\..\libx264\common\x86\mc-a.asm" "..\..\libx264\common\x86\mc-a2.asm" "..\..\libx264\common\x86\pixel-32.asm" "..\..\libx264\common\x86\pixel-a.asm" "..\..\libx264\common\x86\predict-a.asm" "..\..\libx264\common\x86\quant-a.asm" "..\..\libx264\common\x86\sad-a.asm"" exited with code 1. libx264 C:\FS_GIT\libs\win32\libx264\vsyasm.targets 45 Error C2737 'std::is_same_v': 'constexpr' object must be initialized gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 100 Error C2998 'const bool std::is_same_v': cannot be a template definition gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 100 Error C2737 'std::is_integral_v': 'constexpr' object must be initialized gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 245 Error C2998 'const bool std::is_integral_v': cannot be a template definition gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 245 Error C2737 'std::is_floating_point_v': 'constexpr' object must be initialized gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 282 Error C2998 'const bool std::is_floating_point_v': cannot be a template definition gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 282 Error C2737 'std::is_arithmetic_v': 'constexpr' object must be initialized gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 295 Error C2998 'const bool std::is_arithmetic_v': cannot be a template definition gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 295 Error C2737 'std::is_function_v': 'constexpr' object must be initialized gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xstddef 697 Error C2998 'const bool std::is_function_v': cannot be a template definition gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xstddef 697 Error C2275 '_To': illegal use of this type as an expression gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 524 Error C2275 '_From': illegal use of this type as an expression gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 524 Error C3861 '__is_assignable': identifier not found gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 524 Error C2975 '_Val': invalid template argument for 'std::integral_constant', expected compile-time constant expression gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 524 Error C2061 syntax error: identifier '__make_integer_seq' gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1245 Error C2065 '_Vals': undeclared identifier gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1249 Error C2975 '_Vals': invalid template argument for 'std::integer_sequence', expected compile-time constant expression gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1249 Error C2061 syntax error: identifier 'make_integer_sequence' gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1252 Error C2631 'identity': a class or enum cannot be defined in an alias template gsmlib C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1261 Error C1903 unable to recover from previous error(s); stopping compilation gsmlib C:\FS_GIT\src\mod\endpoints\mod_gsmopen\gsmlib\gsmlib-1.10-patched-13ubuntu\gsmlib\gsm_win32_serial.cc 1 Error C2737 'std::is_same_v': 'constexpr' object must be initialized libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 100 Error C2998 'const bool std::is_same_v': cannot be a template definition libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 100 Error C2737 'std::is_integral_v': 'constexpr' object must be initialized libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 245 Error C2998 'const bool std::is_integral_v': cannot be a template definition libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 245 Error C2737 'std::is_floating_point_v': 'constexpr' object must be initialized libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 282 Error C2998 'const bool std::is_floating_point_v': cannot be a template definition libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 282 Error C2737 'std::is_arithmetic_v': 'constexpr' object must be initialized libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 295 Error C2998 'const bool std::is_arithmetic_v': cannot be a template definition libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xtr1common 295 Error C2737 'std::is_function_v': 'constexpr' object must be initialized libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xstddef 697 Error C2998 'const bool std::is_function_v': cannot be a template definition libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\xstddef 697 Error C2275 '_To': illegal use of this type as an expression libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 524 Error C2275 '_From': illegal use of this type as an expression libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 524 Error C3861 '__is_assignable': identifier not found libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 524 Error C2975 '_Val': invalid template argument for 'std::integral_constant', expected compile-time constant expression libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 524 Error C2061 syntax error: identifier '__make_integer_seq' libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1245 Error C2065 '_Vals': undeclared identifier libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1249 Error C2975 '_Vals': invalid template argument for 'std::integer_sequence', expected compile-time constant expression libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1249 Error C2061 syntax error: identifier 'make_integer_sequence' libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1252 Error C2631 'identity': a class or enum cannot be defined in an alias template libcbt C:\Program Files\Microsoft Visual Studio 14.0\VC\include\type_traits 1261 Error C1903 unable to recover from previous error(s); stopping compilation libcbt C:\FS_GIT\src\mod\endpoints\mod_gsmopen\libctb-0.16\src\serportx.cpp 1 Error C1001 An internal error has occurred in the compiler. esl C:\FS_GIT\libs\esl\src\esl.c 525 Error C1083 Cannot open include file: 'defines.h': No such file or directory libcodec2 C:\FS_GIT\libs\libcodec2-2.59\src\codebookge.c 8 Error C1083 Cannot open include file: 'defines.h': No such file or directory libcodec2 C:\FS_GIT\libs\libcodec2-2.59\src\codebookdt.c 8 Error C1083 Cannot open include file: 'defines.h': No such file or directory libcodec2 C:\FS_GIT\libs\libcodec2-2.59\src\codebookvqanssi.c 8 Error C1083 Cannot open include file: 'defines.h': No such file or directory libcodec2 C:\FS_GIT\libs\libcodec2-2.59\src\codebookjvm.c 8 Error C1083 Cannot open include file: 'defines.h': No such file or directory libcodec2 C:\FS_GIT\libs\libcodec2-2.59\src\codebookjnd.c 8 Error C1083 Cannot open include file: 'defines.h': No such file or directory libcodec2 C:\FS_GIT\libs\libcodec2-2.59\src\codebookvq.c 8 Error C1083 Cannot open include file: 'defines.h': No such file or directory libcodec2 C:\FS_GIT\libs\libcodec2-2.59\src\codebookd.c 8 Error C1083 Cannot open include file: 'defines.h': No such file or directory libcodec2 C:\FS_GIT\libs\libcodec2-2.59\src\codebook.c 8 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\pack.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\quantise.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\phase.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\lsp.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\interp.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\kiss_fft.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\fdmdv.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\fifo.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\codec2.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\sine.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\postfilter.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\nlp.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\lpc.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error C1083 Cannot open source file: 'C:\FS_GIT\libs\libcodec2-2.59\src\dump.c': No such file or directory libcodec2 C:\FS_GIT\libs\win32\libcodec2\c1 1 Error LNK1104 cannot open file 'C:\FS_GIT\Win32\Debug\libteletone.lib' FreeSwitchCoreLib C:\FS_GIT\w32\Library\LINK 1 Error C1001 An internal error has occurred in the compiler. mod_logfile c:\fs_git\src\include\switch_loadable_module.h 533 Error C1001 An internal error has occurred in the compiler. mod_tone_stream c:\fs_git\src\include\switch_loadable_module.h 533 Error C1001 An internal error has occurred in the compiler. mod_expr c:\fs_git\src\include\switch_loadable_module.h 533 Error C1001 An internal error has occurred in the compiler. mod_snom c:\fs_git\src\include\switch_loadable_module.h 533 Error LNK1181 cannot open input file 'C:\FS_GIT\Win32\Debug\FreeSwitchCore.lib' mod_shout C:\FS_GIT\src\mod\formats\mod_shout\LINK 1 Error LNK1181 cannot open input file 'C:\FS_GIT\Win32\Debug\FreeSwitchCore.lib' mod_lua C:\FS_GIT\src\mod\languages\mod_lua\LINK 1 Error C1001 An internal error has occurred in the compiler. mod_siren c:\fs_git\src\include\switch_loadable_module.h 533 Error C1001 An internal error has occurred in the compiler. mod_say_zh c:\fs_git\src\include\switch_loadable_module.h 533