Thursday, February 3, 2022

[SOLVED] Unable to launch a website using KestrelHttpServer (Error : Object reference not set to an instance of an object)

Issue

I have installed mono 3.10.0 from source in my Linux VM (Centos 7)

I have installed KVM using the link provided in ASP.NET home on Github 

curl -sSL https://raw.githubusercontent.com/aspnet/Home/master/kvminstall.sh | sh && source ~/.kre/kvm/kvm.sh

and kpm restore is working file and restoring all packages

but i am not able to run k kestrel in the HelloMvc samples from Asp.Net Home Github
I gives error 

System.NullReferenceException: Object reference not set to an instance of an object
  at Microsoft.AspNet.Server.Kestrel.Networking.Libuv.loop_size () [0x00000] in <filename unknown>:0 
  at Microsoft.AspNet.Server.Kestrel.Networking.UvLoopHandle.Init (Microsoft.AspNet.Server.Kestrel.Networking.Libuv uv) [0x00000] in <filename unknown>:0 
  at Microsoft.AspNet.Server.Kestrel.KestrelThread.ThreadStart (System.Object parameter) [0x00000] in <filename unknown>:0

I have also tried to isntall libuv from source still no luck

Edit

Steps Followed for libuv install :

wget http://dist.libuv.org/dist/v1.0.0-rc1/libuv-v1.0.0-rc2.tar.gz
tar -xvf libuv-v1.0.0-rc2.tar.gz
cd libuv-v1.0.0-rc2/
./gyp_uv.py -f make -Duv_library=shared_library
make -C out
sudo cp out/Debug/lib.target/libuv.so /usr/lib/libuv.so.1.0.0-rc2
sudo ln -s libuv.so.1.0.0-rc2 /usr/lib/libuv.so.1

Exception after installing Libuv again

System.ArgumentException: An element with the same key already exists in the dictionary.
  at System.Collections.Generic.Dictionary`2[TKey,TValue].Add (System.Collections.Generic.TKey key, System.Collections.Generic.TValue value) [0x00000] in <filename unknown>:0 
  at System.Linq.Enumerable.ToDictionary[DictionaryEntry,String,String] (IEnumerable`1 source, System.Func`2 keySelector, System.Func`2 elementSelector, IEqualityComparer`1 comparer) [0x00000] in <filename unknown>:0 
  at Microsoft.Framework.ConfigurationModel.EnvironmentVariablesConfigurationSource.Load (IDictionary envVariables) [0x00000] in <filename unknown>:0 
  at Microsoft.Framework.ConfigurationModel.EnvironmentVariablesConfigurationSource.Load () [0x00000] in <filename unknown>:0 
  at Microsoft.Framework.ConfigurationModel.Configuration.Add (IConfigurationSource configurationSource) [0x00000] in <filename unknown>:0 
  at Microsoft.Framework.ConfigurationModel.ConfigurationExtensions.AddEnvironmentVariables (IConfigurationSourceContainer configuration) [0x00000] in <filename unknown>:0 
  at Microsoft.AspNet.Hosting.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0

Solution

Take a look at http://olivierlefebvre.tumblr.com/post/101523386694/asp-vnext-alpa4-on-ubuntu

I fixed like that.

Step Used

git clone https://github.com/joyent/libuv.git
cd libuv
sh autogen.sh
./configure
make
make check
sudo make install

Final by adding a symlink to the lib

ln /usr/local/lib/libuv.so -sf ~/.kpm/packages/Microsoft.AspNet.Server.Kestrel/1.0.0-alpha4/native/darwin/universal/libuv.dylib


Answered By - agua from mars
Answer Checked By - Dawn Plyler (WPSolving Volunteer)
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