c# - CS1617: Invalid option ‘6’ for /langversion; must be ISO-1, ISO-2, 3, 4, 5 or Default -


kept getting error when running fresh asp.net mvc application (straight out of vs 2015 community) on windows 2008 server machine.

lots of people running it, wanted post here

found crazy easy fix guy: expertdebugger.

<system.codedom>     <compilers>       <compiler language=”c#;cs;csharp” extension=”.cs” type=”microsoft.csharp.csharpcodeprovider, system, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089″ warninglevel=”4″ compileroptions=”/langversion:6 /nowarn:1659;1699;1701″>         <provideroption name=”compilerversion” value=”v4.0″/>       </compiler>       <compiler language=”vb;vbs;visualbasic;vbscript” extension=”.vb” type=”microsoft.visualbasic.vbcodeprovider, system, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089″ warninglevel=”4″ compileroptions=”/langversion:14 /nowarn:41008 /define:_mytype=\&quot;web\&quot; /optioninfer+”>           <provideroption name=”compilerversion” value=”v4.0″/>       </compiler>     </compilers>   </system.codedom>

change langversion:6 towards bottom 6 5 - langversion:5

fixed me. thank him.


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