# OpenSearch.Net Method not found issue **URL:** \ **Category:** OpenSearch Client Libraries\ **Tags:** clients-general, opensearch-net\ **Created:** [June 22, 2023, 12:21pm UTC](https://forum.opensearch.org/t/opensearch-net-method-not-found-issue/14794 "2023-06-22T12:21:49Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Denied5](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.opensearch.org/denied5/32/5682_2.png) [@Denied5](https://forum.opensearch.org/u/Denied5)\ **Post date:** [June 22, 2023, 12:21pm UTC](https://forum.opensearch.org/t/opensearch-net-method-not-found-issue/14794/1 "2023-06-22T12:21:49Z")
**Versions** (relevant - OpenSearch/Dashboard/Server OS/Browser): Server: OpenSearch Version=“1.3” Client: .Net OpenSearch.Client Version=“1.3.0” .Net version: .Net 6.0 **Describe the issue** : Hi, I have faced issue while following the startup guide for [AWS SigV4 support for OpenSearch](https://opensearch.org/blog/aws-sigv4-support-for-clients/). ```auto Console.WriteLine("Os client"); var connection = new AwsSigV4HttpConnection(); var config = new ConnectionSettings(new SingleNodeConnectionPool(uri), connection) .DefaultIndex("people") .DisableDirectStreaming(); var client = new OpenSearchClient(config); Console.WriteLine("Start requests"); var response = client.Index(person, i => i.Index("persons")); ``` On client.Index() line i receive this error: ```auto Method not found: 'System.String Amazon.Util.AWSSDKUtils.CanonicalizeResourcePathV2(System.Uri, System.String, Boolean, System.Collections.Generic.IDictionary`2)'. ``` I have tried to change versions of OpenSearch.Client and OpenSearch.Net.Auth.AwsSigV4 but it didn’t fix the issue. **Configuration** : I’m running this code in AWS Lambda with such packages: ```auto ``` **Relevant Logs or Screenshots** : Error log: ```auto OpenSearch.Net.UnexpectedOpenSearchClientException: Method not found: 'System.String Amazon.Util.AWSSDKUtils.CanonicalizeResourcePathV2(System.Uri, System.String, Boolean, System.Collections.Generic.IDictionary`2)'. ---> System.MissingMethodException: Method not found: 'System.String Amazon.Util.AWSSDKUtils.CanonicalizeResourcePathV2(System.Uri, System.String, Boolean, System.Collections.Generic.IDictionary`2)'. at OpenSearch.Net.Auth.AwsSigV4.CanonicalRequest.From(HttpRequestMessage request, ImmutableCredentials credentials, DateTime signingTime) at OpenSearch.Net.Auth.AwsSigV4.AwsSigV4Util.SignRequest(HttpRequestMessage request, ImmutableCredentials credentials, RegionEndpoint region, DateTime signingTime, String service) at OpenSearch.Net.Auth.AwsSigV4.AwsSigV4HttpClientHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) ``` (i can add full log on request) ---
**Author:** ![xtansia](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.opensearch.org/xtansia/32/4961_2.png) [@xtansia](https://forum.opensearch.org/u/xtansia)\ **Post date:** [June 22, 2023, 9:33pm UTC](https://forum.opensearch.org/t/opensearch-net-method-not-found-issue/14794/2 "2023-06-22T21:33:48Z")
Hi @Denied5, This error would generally be caused by an old AWSSDK.Core version being pulled in but I don’t immediately see why that would happen with the dependencies you have listed. Would you be able to please run `dotnet list package --include-transitive` from within your project that is being deployed to Lambda and copy the output here? Please also verify that the artifact being deployed contains `AWSSDK.Core.dll`. Further, if possible, a complete minimal reproducing project would be helpful for understanding. Thanks! ---
**Author:** ![Denied5](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.opensearch.org/denied5/32/5682_2.png) [@Denied5](https://forum.opensearch.org/u/Denied5)\ **Post date:** [June 23, 2023, 7:28am UTC](https://forum.opensearch.org/t/opensearch-net-method-not-found-issue/14794/3 "2023-06-23T07:28:41Z")
Hi @xtansia, thanks for your help! Project ‘\*\*\*’ has the following package references [net6.0]: Top-level Package Requested Resolved > Amazon.Lambda.Core 2.1.0 2.1.0 > Amazon.Lambda.Serialization.SystemTextJson 2.3.1 2.3.1 > AWSSDK.SecurityToken 3.7.103.16 3.7.103.16 > OpenSearch.Client 1.3.0 1.3.0 > OpenSearch.Net.Auth.AwsSigV4 1.3.0 1.3.0 Transitive Package Resolved > AWSSDK.Core 3.7.107.8 > Microsoft.CSharp 4.6.0 > [OpenSearch.Net](http://OpenSearch.Net) 1.3.0 > System.Buffers 4.5.1 > System.Diagnostics.DiagnosticSource 6.0.0 > System.Runtime.CompilerServices.Unsafe 6.0.0 During lambda deployment i can notice `AWSSDK.Core.dll` in dependencies: ![image](https://us1.discourse-cdn.com/flex019/uploads/mauve_hedgehog/original/2X/5/5940282a9d838d6244a95cea5102765f4520725c.png) ---
**Author:** ![Denied5](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.opensearch.org/denied5/32/5682_2.png) [@Denied5](https://forum.opensearch.org/u/Denied5)\ **Post date:** [June 23, 2023, 11:46am UTC](https://forum.opensearch.org/t/opensearch-net-method-not-found-issue/14794/4 "2023-06-23T11:46:32Z")
The problem was in how lambda tool works with nugets. Previously I experimented with a newer version of a nuget package and it was saved in a bin folder, Lambda tool collects the latest versions of packages from bin folder. So for me solution was to remove bin and obj folders and publish lambda again ---
**Author:** ![system](https://us1.discourse-cdn.com/flex019/uploads/mauve_hedgehog/original/2X/3/33547ea01a5b12dcca2958411d3edd97ae2ea8c1.png) [@system](https://forum.opensearch.org/u/system)\ **Post date:** [August 22, 2023, 11:47am UTC](https://forum.opensearch.org/t/opensearch-net-method-not-found-issue/14794/5 "2023-08-22T11:47:18Z")
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