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This topic created in 3657 days ago, the information mentioned may be changed or developed.
换了一个系统， xubuntu14 ，然后今天安装 YCM 的时候出错了错误，我的安装指令是./install.py -all
msbuild or xbuild is required to build Omnisharp 后来查到了这篇回答，why-is-omnisharp-not-working，看到了 programingfrik 的答案，说是omnisharp没能正确安装，于是我切换到YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer目录下，执行了一下安装指令
git checkout master git submodule update --init --recursive sudo apt-get install mono-xbuild xbuild 然后又报错了，这回不知道该咋办了，特来向 V 友们求助！
我的分支和 mono 版本是这样的：
/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer (master) $ git branch -v * master e190291 Merge pull request #207 from micbou/drive-letter /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer (master) $ mono --version Mono JIT compiler version 3.2.8 (Debian 3.2.8+dfsg-4ubuntu1.1) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: amd64 Disabled: none Misc: softdebug LLVM: supported, not enabled. GC: sgen 报的错误是这样的：
/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer (master) $ xbuild XBuild Engine Version 12.0 Mono, Version 3.2.8.0 Copyright (C) 2005-2013 Various Mono authors Build started 4/22/2016 10:44:14 PM. __________________________________________________ Project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/OmniSharp.sln" (default target(s)): Target ValidateSolutionConfiguration: Building solution configuration "Debug|Any CPU". Target Build: Project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/Microsoft.Build.Evaluation/Microsoft.Build.Evaluation.csproj" (default target(s)): Target PrepareForBuild: : error : Error initializing task Message: Could not load file or assembly 'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot find the file specified. Task "Message" execution -- FAILED Done building target "PrepareForBuild" in project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/Microsoft.Build.Evaluation/Microsoft.Build.Evaluation.csproj".-- FAILED Target _RecordCleanFile: : error : Error initializing task ReadLinesFromFile: Could not load file or assembly 'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot find the file specified. Task "ReadLinesFromFile" execution -- FAILED Done building target "_RecordCleanFile" in project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/Microsoft.Build.Evaluation/Microsoft.Build.Evaluation.csproj".-- FAILED Done building project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/Microsoft.Build.Evaluation/Microsoft.Build.Evaluation.csproj".-- FAILED Project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/NRefactory/ICSharpCode.NRefactory/ICSharpCode.NRefactory.csproj" (default target(s)): Target PrepareForBuild: : error : Error initializing task Message: Could not load file or assembly 'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot find the file specified. Task "Message" execution -- FAILED Done building target "PrepareForBuild" in project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/NRefactory/ICSharpCode.NRefactory/ICSharpCode.NRefactory.csproj".-- FAILED Target _RecordCleanFile: : error : Error initializing task ReadLinesFromFile: Could not load file or assembly 'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot find the file specified. Task "ReadLinesFromFile" execution -- FAILED Done building target "_RecordCleanFile" in project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/NRefactory/ICSharpCode.NRefactory/ICSharpCode.NRefactory.csproj".-- FAILED Done building project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/NRefactory/ICSharpCode.NRefactory/ICSharpCode.NRefactory.csproj".-- FAILED Task "MSBuild" execution -- FAILED Done building target "Build" in project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/OmniSharp.sln".-- FAILED Done building project "/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/OmniSharp.sln".-- FAILED Build FAILED. Errors: /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/OmniSharp.sln (default targets) -> (Build target) -> /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/Microsoft.Build.Evaluation/Microsoft.Build.Evaluation.csproj (default targets) -> /usr/lib/mono/4.5/Microsoft.Common.targets (PrepareForBuild target) -> : error : Error initializing task Message: Could not load file or assembly 'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot find the file specified. /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/OmniSharp.sln (default targets) -> (Build target) -> /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/Microsoft.Build.Evaluation/Microsoft.Build.Evaluation.csproj (default targets) -> /usr/lib/mono/4.5/Microsoft.Common.targets (_RecordCleanFile target) -> : error : Error initializing task ReadLinesFromFile: Could not load file or assembly 'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot find the file specified. /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/OmniSharp.sln (default targets) -> (Build target) -> /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/NRefactory/ICSharpCode.NRefactory/ICSharpCode.NRefactory.csproj (default targets) -> /usr/lib/mono/4.5/Microsoft.Common.targets (PrepareForBuild target) -> : error : Error initializing task Message: Could not load file or assembly 'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot find the file specified. /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/OmniSharp.sln (default targets) -> (Build target) -> /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/NRefactory/ICSharpCode.NRefactory/ICSharpCode.NRefactory.csproj (default targets) -> /usr/lib/mono/4.5/Microsoft.Common.targets (_RecordCleanFile target) -> : error : Error initializing task ReadLinesFromFile: Could not load file or assembly 'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot find the file specified. 0 Warning(s) 4 Error(s) Time Elapsed 00:00:00.5894150 望 V 友们给个提示呗，这是啥错误啊，从哪里入手解决！
Supplement 1 Apr 23, 2016
折腾了一下，决定不整了，记录一下我折腾的情况吧！
首先，发现自己装的时候装错了，我安装YCM的时候，用的是./install.py -all，这是默认安装所有特性，其中就包括了，C#的补全（./install.py --omnisharp-completer）而报错的这个OmniSharpServer库，正是C#的补全库！，什么鬼，Linux下写C#这种事情我根本不会干好伐！
但是觉得已经开搞了，不试着解决解决总是怪怪的，于是找了一下解决方案，发现我少装了两个包，又装了这么两个包 ！
sudo apt-get install libmono-microsoft-build-tasks-v4.0-4.0-cil sudo apt-get install mono-dmcs Supplement 2 Apr 23, 2016
但是还是报错啊，错误是这样的：
/home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/OmniSharp.sln (default targets) -> (Build target) -> /home/michael/Bundle/k-vim/bundle/YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer/OmniSharp/OmniSharp.csproj (default targets) -> /usr/lib/mono/4.5/Microsoft.CSharp.targets (CoreCompile target) -> : error CS8001: Warning as Error: SDK path could not be resolved 然后我就无解了，最终决定放弃，因为我根本不会在VIM中写C#啊，感觉自己真是闲的蛋疼！
 | 1 bwangel OP 报错的编译命令是好长好长的一句， V2 贴不上来啊！ |
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