# [Mono-dev] Trying to run teste.exe

Robert Jordan robertj at gmx.net
Sat Jun 19 07:11:17 EDT 2010

```On 19.06.2010 13:04, guysherman wrote:
>
> Hi Zoltan,
>
> Thanks very much for that, that seems to have fixed it. I get a new error
> now, though.
>
> The error is the following:
>
> Corlib too old for this runtime.
> Loaded from: C:\Program Files (x86)\Mono-2.6.4\lib\mono\2.0\mscorlib.dll
>
> When I execute my freshly built runtime with the -V flag, it says version
> 2.7.
>
> Do I need a more recent build of mcs?

Yes, you need a matching mcs tree, optimally of the same version