how to fix : Could not load file or assembly 'Azure.Core'

Question

how to fix : Could not load file or assembly 'Azure.Core'

Peter Clift (INFOSYS LIMITED) 11

I have a .net framework 4.2 Test Project, which calls methods in .net 4.2 a class library called Interface. Interface references another class library that holds the nuget 'azure.core'

in the test project , I tried adding a bindingRedirect to app.config , but did not fix :

      <dependentAssembly>  
        <assemblyIdentity name="Azure.Core" publicKeyToken="92742159e12e44c8" culture="neutral" />  
        <bindingRedirect oldVersion="0.0.0.0-1.25.0.0" newVersion="1.25.0.0" />  
      </dependentAssembly>

here is the error :
Exeption message "Could not load file or assembly 'Azure.Core, Version=1.25.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)":"Azure.Core, Version=1.25.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8"} System.Exception {System.IO.FileLoadException}

inner exception : - InnerException {"Could not load file or assembly 'Azure.Core, Version=1.19.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)":"Azure.Core, Version=1.19.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8"} System.Exception {System.IO.FileLoadException}

Any tips?
Thanks,Peter

Tianyu Sun-MSFT 34,686 Reputation points Microsoft External Staff

2022-09-02T08:56:02.777+00:00

Hi @Peter Clift (INFOSYS LIMITED) ,

Welcome to Microsoft Q&A forum. Can you confirm that the Azure.Core NuGet package version 1.25.0.0 is installed(exists) locally? And, have you tried to change the version to 1.19.0.0 in bindingRedirect? Like <bindingRedirect oldVersion="0.0.0.0-1.19.0.0" newVersion="1.19.0.0" />? Besides, did you miss this line <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> in app.config file?
Peter Clift (INFOSYS LIMITED) 11 Reputation points

2022-09-06T15:34:48.447+00:00

hi, TianyuSun,

Azure.core dll is installed - see picture below.

My understanding is that my binding redirect is for a range , so it should have fixed the 1.19.0.0 version. Right?
Tianyu Sun-MSFT 34,686 Reputation points Microsoft External Staff

2022-09-07T08:35:20.543+00:00

Hi Peter,

Yes. So does cleaning NuGet package cache then restoring NuGet packages, and rebuilding your project work?
Peter Clift (INFOSYS LIMITED) 11 Reputation points

2022-09-08T15:59:34.133+00:00

hi TianyuSun,

I don't understand why cleaning NuGet package cache would help. I have a similar project which works fine on my dev machine.
Tianyu Sun-MSFT 34,686 Reputation points Microsoft External Staff

2022-09-09T06:53:12.813+00:00

Hi Peter,

Sometimes, the modifications are set but the cache(nuget cache and project cache) doesn’t change at once, this may lead to this issue. So cleaning the cache or reinstalling the package and rebuilding the project may work.
Peter Clift (INFOSYS LIMITED) 11 Reputation points

2022-09-13T18:44:37.73+00:00

can anyone else help me?

maybe a dependent assembly is missing a redirect -how do I find it?
Navjot 46 Reputation points

2023-03-14T00:17:36.7066667+00:00

Hi Peter,

I am from Infosys too and facing exactly same problem. But the solution you posted below is not working for me. Can you please let me know where exactly I need to put these tags in csproj file.

Thanks
Abhale, Sankalp 0 Reputation points

2023-05-15T21:18:21.48+00:00

I am also facing same issue, but not for Azure.Core, Instead I am facing this issue for Microsoft.Identity.Client. This package is called internally when we call graph api from azure identity. PLease let me know if you get any solution

1 answer

Your answer

Tianyu Sun-MSFT 34,686 Reputation points Microsoft External Staff

2022-09-02T08:56:02.777+00:00

Hi @Peter Clift (INFOSYS LIMITED) ,

Welcome to Microsoft Q&A forum. Can you confirm that the Azure.Core NuGet package version 1.25.0.0 is installed(exists) locally? And, have you tried to change the version to 1.19.0.0 in bindingRedirect? Like <bindingRedirect oldVersion="0.0.0.0-1.19.0.0" newVersion="1.19.0.0" />? Besides, did you miss this line <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> in app.config file?
Peter Clift (INFOSYS LIMITED) 11 Reputation points

2022-09-06T15:34:48.447+00:00

hi, TianyuSun,

Azure.core dll is installed - see picture below.

My understanding is that my binding redirect is for a range , so it should have fixed the 1.19.0.0 version. Right?
Tianyu Sun-MSFT 34,686 Reputation points Microsoft External Staff

2022-09-07T08:35:20.543+00:00

Hi Peter,

Yes. So does cleaning NuGet package cache then restoring NuGet packages, and rebuilding your project work?
Peter Clift (INFOSYS LIMITED) 11 Reputation points

2022-09-08T15:59:34.133+00:00

hi TianyuSun,

I don't understand why cleaning NuGet package cache would help. I have a similar project which works fine on my dev machine.
Tianyu Sun-MSFT 34,686 Reputation points Microsoft External Staff

2022-09-09T06:53:12.813+00:00

Hi Peter,

Sometimes, the modifications are set but the cache(nuget cache and project cache) doesn’t change at once, this may lead to this issue. So cleaning the cache or reinstalling the package and rebuilding the project may work.
Peter Clift (INFOSYS LIMITED) 11 Reputation points

2022-09-13T18:44:37.73+00:00

can anyone else help me?

maybe a dependent assembly is missing a redirect -how do I find it?
Navjot 46 Reputation points

2023-03-14T00:17:36.7066667+00:00

Hi Peter,

I am from Infosys too and facing exactly same problem. But the solution you posted below is not working for me. Can you please let me know where exactly I need to put these tags in csproj file.

Thanks
Abhale, Sankalp 0 Reputation points

2023-05-15T21:18:21.48+00:00

I am also facing same issue, but not for Azure.Core, Instead I am facing this issue for Microsoft.Identity.Client. This package is called internally when we call graph api from azure identity. PLease let me know if you get any solution

Answer 1

Peter Clift (INFOSYS LIMITED) 11

I answered my question. I added this to csproj of calling test project :

<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>  
<GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>

Tianyu Sun-MSFT 34,686 Reputation points Microsoft External Staff

2022-09-15T07:43:59.873+00:00

Hi Peter,

Thanks for sharing your solution here, and I’m happy to hear that this issue doesn’t block you any more.

Have a nice day.

Regards,
Tianyu
Navjot 46 Reputation points

2023-03-14T20:19:49.43+00:00

Hi Peter,

I am from Infosys too and facing exactly same problem. But the solution you posted below is not working for me. Can you please let me know where exactly I need to put these tags in csproj file.

Thanks
Paulson 0 Reputation points

2023-10-26T13:27:49.3+00:00

Thanks Peter, that fixed for my case
Paulson 0 Reputation points

2023-10-26T13:28:32.9+00:00

that worked for me, thanks Peter

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how to fix : Could not load file or assembly 'Azure.Core'

1 answer

Your answer