HandlebarsDotNet and AoT

[MalayAgr]

Hi,

I have an application where the tools are based on Handlebars. I am trying to compile the application into a native AOT application. While running the tools, I am running into the following error:

System.PlatformNotSupportedException: Operation is not supported on this platform.
   at System.Reflection.Assembly.GetCallingAssembly() + 0x77
   at HandlebarsDotNet.Helpers.HandlebarsHelpers.Register(IHandlebars, Action`1) + 0x623
   at Microsoft.SemanticKernel.PromptTemplates.Handlebars.HandlebarsPromptTemplate.RegisterHelpers(IHandlebars, Kernel, KernelArguments, CancellationToken) + 0xdc
   at Microsoft.SemanticKernel.PromptTemplates.Handlebars.HandlebarsPromptTemplate.<RenderAsync>d__2.MoveNext() + 0xc7
--- End of stack trace from previous location ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x32
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xe9
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x88
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x31
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult() + 0x26
   at Microsoft.SemanticKernel.Planning.Handlebars.HandlebarsPlan.<InvokeCoreAsync>d__9.MoveNext() + 0x284
--- End of stack trace from previous location ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x32
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xe9
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x88
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x31
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult() + 0x26
   at Microsoft.SemanticKernel.Planning.PlannerInstrumentation.<InvokePlanAsync>d__5`3.MoveNext() + 0x5a5

As per my understanding, this is because of the HandlebarsDotNet library using System.Reflection.Assembly.GetCallingAssembly(), which is not supported in AOT. I wanted to understand if there is a way to get around this problem by making changes in my application source code.

Please note that due to business reasons, it's not possible for me to migrate from handlebars based planning. So a workaround will be necessary.

For context, I am using Semantic Kernel version 1.32.0 and SemanticKernel.Planners.Handlebars version 1.32.0-preview.

[sophialagerkranspandey]

We'd recommend reaching out to the Handlebars team Handlebars-Net/Handlebars.Net: A real .NET Handlebars engine to get AoT added.

[MalayAgr]

Yes, I can do that but I was just wondering if there is a workaround I can use currently to solve the issue.