System.IO.FileLoadException: Could not load file or assembly 'Google.Api.Gax.Grpc, Version=2.1.0.0'

[NPSF3000]

System.IO.FileLoadException: Could not load file or assembly 'Google.Api.Gax.Grpc, Version=2.1.0.0, Culture=neutral, PublicKeyToken=3ec5ea7f18953e47' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference.

.Net 4.6.1 Error occurs when trying to execute Google.Cloud.PubSub.V1 (1.0.0-beta13) code.

We do have binding redirects (that have correct versions):

      <dependentAssembly>
        <assemblyIdentity name="Google.Api.Gax" publicKeyToken="3ec5ea7f18953e47" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.2.1.0" newVersion="2.2.1.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Google.Api.Gax.Grpc" publicKeyToken="3ec5ea7f18953e47" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.2.1.0" newVersion="2.2.1.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Google.Api.Gax.Rest" publicKeyToken="3ec5ea7f18953e47" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.2.1.0" newVersion="2.2.1.0" />
      </dependentAssembly>

[jskeet]

Could you give us the context of what kind of app this is? What other dependencies do you have? (If we could reproduce this, it'll make it much easier to fix.)

If you update to beta15 does that work? (I'd still expect this to work with beta13, but it would be good to know.)

[NPSF3000]

@jskeet It's an ASP.NET web service (ASMX). We have quite a few dependencies including Cloud IAM, Storage, Plus as well as AWS and non google libraries.

Beta15 does appear to work (I didn't see it due to it being a pre-release) - thanks!

[jskeet]

Beta13 is a pre-release too, of course :) I wonder whether the issue is that Beta13 relied on a pre-release of Google.Api.Gax.Grpc. It's possible that there was a breaking change from beta to GA there.

I'll try Beta13 + Storage latest + IAM latest. If you can give me details of the IAM/Storage versions, that would be even better.

[NPSF3000]

Looks like we have:

 <package id="Google.Api.CommonProtos" version="1.1.0" targetFramework="net461" />
  <package id="Google.Api.Gax" version="2.2.1" targetFramework="net461" />
  <package id="Google.Api.Gax.Grpc" version="2.2.1" targetFramework="net461" />
  <package id="Google.Api.Gax.Rest" version="2.2.1" targetFramework="net461" />
  <package id="Google.Apis" version="1.30.0" targetFramework="net461" />
  <package id="Google.Apis.Auth" version="1.30.0" targetFramework="net461" />
  <package id="Google.Apis.Bigquery.v2" version="1.29.1.983" targetFramework="net461" />
  <package id="Google.Apis.Core" version="1.30.0" targetFramework="net461" />
  <package id="Google.Apis.DLP.v2beta1" version="1.29.1.991" targetFramework="net461" />
  <package id="Google.Apis.Oauth2.v2" version="1.24.1.672" targetFramework="net452" />
  <package id="Google.Apis.Plus.v1" version="1.29.1.970" targetFramework="net461" />
  <package id="Google.Apis.Storage.v1" version="1.29.1.988" targetFramework="net461" />
  <package id="Google.Cloud.Iam.V1" version="1.0.0-beta13" targetFramework="net461" />
  <package id="Google.Cloud.PubSub.V1" version="1.0.0-beta15" targetFramework="net461" />
  <package id="Google.Cloud.Storage.V1" version="2.0.0" targetFramework="net461" />
  <package id="Google.Protobuf" version="3.3.0" targetFramework="net461" />
  <package id="Grpc.Auth" version="1.7.0" targetFramework="net461" />
  <package id="Grpc.Core" version="1.7.1" targetFramework="net461" />

At least you know your work is appreciated ;)

[jskeet]

Okay - I'd expect the Google.Apis parts to be irrelevant, but I'll try that combination of IAM, Storage, PubSub and Gax.Grpc.

[NPSF3000]

Awesome. Just so you know having beta15 work is good enough for us at this time, so I consider this resolved.

I hope this info helps you understand the root cause.

[jskeet]

Hmm - I've just tried this, and I can't reproduce the problem. If you can easily reproduce it in a way that I'd be able to take a look at, I'd be interested to see that - but otherwise, it's probably worth closing until we see this again. (It's possible that mixtures of prereleases for support libraries could cause issues. That may be what's wrong here, but it's hard to know for sure.)

(As an aside, we have Google.Cloud packages for BigQuery and DLP that you may want to try too...)

[NPSF3000]

Agreed. I might be able to create a reproducible case... but it's not worth our time at this moment. If we see this again we'll let you know.

[jskeet]

Sounds good to me, thanks - I completely appreciate that reproducing it now you've got an alternative isn't a priority :)