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Question by FranticDreamer · Sep 15, 2017 at 02:39 PM · buildmonodevelopvisualstudiosolutioncs

Error CS1617 Langversion '4'

Hi.I want to build my solution in monodevelop (F8) but it says:

Error CS1617:Invalid option ‘4’ for /langversion; must be ISO-1, ISO-2, 3 or Default (CS1617) (Assembly-CSharp)

I installed VS2010,this error ocurred and i updated to VS2015.But its still here.What should i do?

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Answer by ninuxw · Oct 10, 2017 at 01:53 PM

@NoEyesGaming This helped me:

In Mono Develop:

Right click on the assembly-csharp of your project -> Options. Under Build -> General change the drop box "C# Language Version".

I hope it helps you.

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avatar image FranticDreamer · Oct 16, 2017 at 04:06 PM 0
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I'm using Unity 2017.1.1f1.When I change it, it automatically reimports ALL project.So didn't work I think.Thanks anyway :)

avatar image ninuxw · Oct 16, 2017 at 04:09 PM 0
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Sorry to hear it didn't work. Anyway for me its not the ideal solution as it reverts back after unity recompiled the protect, so its very tedious :S

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