Unable to load DLL 'libuv': The specified module could not be found - (kestrel) Windows IOT

[matizk144]

Hi!
I just trying to run basic asp.net project (Hello world) on my RP2, but unfortunatelly always I received error:

.\web : System.DllNotFoundException: Unable to load DLL 'libuv': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
    + CategoryInfo          : NotSpecified: (System.DllNotFo...LT: 0x8007007E):String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError

   at Microsoft.AspNet.Server.Kestrel.Networking.Libuv.NativeMethods.uv_loop_size()
   at Microsoft.AspNet.Server.Kestr
el.Networking.Libuv.loop_size()
   at Microsoft.AspNet.Server.Kestrel.Networking.UvLoopHandle.Init(Libuv uv)
   at Microsoft.AspNet.Server.Kestrel.KestrelThread.ThreadStart(Object parameter)

The problem not appear on my desktop computer for x86 & x64 architectures.
I checked packages and all looks fine, libuv.dll exists.
Btw, when I try run launch server in IOT using weblistener, server starts.

[moozzyk]

You need to publish for win10-arm runtime (--runtime option) - bug aspnet/KestrelHttpServer#340

[Eilon]

@moozzyk close this?

[matizk144]

Always I restore / publish with runtime option. I checked again and doesn't work. Btw. in published package "Microsoft.AspNet.Server.Kestrel" I have folder runtime:
To better understand I use path:
In location:
\10.0.1.61\c$\compiled\approot\packages\Microsoft.AspNet.Server.Kestrel\1.0.0-rc1-final\runtimes
I have folders: osx, win7-x64, win7-x86, win10-arm, which all include libuv.(in subfolder native)
Path example:
\10.0.1.61\c$\compiled\approot\packages\Microsoft.AspNet.Server.Kestrel\1.0.0-rc1-final\runtimes\win10-arm\native\libuv.dll

So, on first looks, that required dlls exists, but something is wrong to load dll. I tryied to rename folder win10-arm to win7-arm, but I have the same result.

[meriturva]

The same here.....i think is it related to: aspnet/KestrelHttpServer#216 and aspnet/KestrelHttpServer#106

[moozzyk]

This is a bug indeed. I am not sure if this is a regression or I tried a slightly different scenario (probably the latter) because I did run Kestrel on a R-Pi2 to verify aspnet/dnx#3095.
FWIW

• publishing with --runtime does not include win10 specific arm dlls because the application is published for win7-arm. I opened a bug for this in the dnx repo: Impossible to specify the Runtime Id of the target OS the app is published for aspnet/dnx#3197
• publishing with --framework is completely broken because the application is published for win7-x86 and win7-x64 even though my original app was only restored for win10-arm. For this I commented on a bug we already had

I think for now the problem could be worked around adding {APPFOLDER}\approot\packages\Microsoft.AspNet.Server.Kestrel\1.0.0-rc2-15950\runtimes\win10-arm\native to the %PATH%.

[matizk144]

I resolved problem, copying libuv.dll to folder, where Microsoft.AspNet.Server.Kestrel exist. But unfortunatelly I observed, that in published package, published runtime (dnx) still use packages from C:\Users[user.dnx\packages.

[MelbourneDeveloper]

I'm getting this error as well. I have all the latest NuGet packages for ASP .NET Core as of right now

[moozzyk]

You cannot get this error since this applies to win10-arm and currently there is no arm runtime available. See also: aspnet/KestrelHttpServer#216 (comment)