Recently I came across an unusual error whilst working with C# Azure Functions. When the Function was executed, the console window showed the following error.

The ‘XXXXXX’ function is in error: Microsoft.Azure.WebJobs.Host: Error indexing method ‘XXXXXX ‘. Microsoft.Azure.WebJobs.Host: Can’t bind parameter ‘data’ to type ‘XXXXXX’.

I checked the Activity function parameter bindings however couldn’t see any obvious issue. However after some head scratching I eventually figured out the source of the issue …

In this post I’ll show you how to resolve this issue.

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