Failuresink not working

Versions (relevant - Latest version):
Serilog.Sinks.Invoitrade.OpenSearch 1.0.0

Describe the issue:
I am using Serilog.Sinks.Invoitrade.OpenSearch library to sink logs into opensearch. Also trying to handle and write log to File log when Open search sync is failing or server is down.
To handle this situation, I am using failuresink in configuration. But it is giving exception. “System.InvalidOperationException: 'Cannot create instance of type ‘Serilog.Core.ILogEventSink’ because it is either abstract or an interface.'”
Kindly assist.

Configuration:

Relevant Logs or Screenshots:

Hi @VartikaSharma, not sure if this helps, but there might be some additional parameters required. Please take a look at a similar issue: c# - How do I add the failureSink to elasticsearchSink - Stack Overflow.