Unable to create email from template

[OwenPattison]

Hello, I've been using the v3.0.0 of FluentEmail.Core along with FluentEmail.Liquid with no problems for the past year or so, however, I have upgraded NSwag to the latest version and now we are unable to create emails due to the following error being thrown:

Error. System.TypeLoadException: Could not load type 'Fluid.BaseFluidTemplate`1' from assembly 'Fluid, Version=0.0.0.0, Culture=neutral, PublicKeyToken=omit'. at FluentEmail.Liquid.LiquidRenderer.ParseAsync[T](String template, T model, Boolean isHtml) at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine) at FluentEmail.Liquid.LiquidRenderer.ParseAsync[T](String template, T model, Boolean isHtml) at FluentEmail.Liquid.LiquidRenderer.Parse[T](String template, T model, Boolean isHtml) at FluentEmail.Core.Email.UsingTemplateFromFile[T](String filename, T model, Boolean isHtml)

Looking through release notes for NSwag 13.15.0 it seems they have migrated to use Fluid, I suspect there could be a mismatch of dependencies now between libs. I've been unable to diagnose the issue any further thus far but any help would be appreciated.

[kolemasov]

Bumped into same problem. In my case I was using Fluid.Core 2.9 package in another part of my application. This caused issues with Liquid Renderer. I assume that there was a breaking change in Fluid.Core and their recent versions are not compatible with the one used by FluentEmail.

[jstafford5380]

Ran into the same problem. NJsonSchema uses Fluid 2.9 and it appears this version of FluentEmail.Liquid uses Fluid.Core >= 2.0.13 but BaseFluidTemplate.cs appears to have been deleted by Fluid.Core 2.0. I cannot find a reference to it in the FluentEmail.Liquid library however, despite the error.

This renderer is working fine in another project of mine but I noticed when I installed it, it pulled in Fluid.Core 1.0. Not sure why... but that works. Unfortunately, since other things like NJsonSchema have a dependency on a later version, I seem have to choose on or the other; emails or jsonschemas...

It seems to happen when the control returns to the ParseAsync method here:

FluentEmail/src/Renderers/FluentEmail.Liquid/LiquidRenderer.cs

Line 53 in e1379c4

var body = await viewTemplate.RenderAsync(context, rendererOptions.TextEncoder);

Which is the first time it tries to do anything with the viewTemplate which was parsed earlier on, here:

FluentEmail/src/Renderers/FluentEmail.Liquid/LiquidRenderer.cs

Line 91 in e1379c4

if (!_parser.TryParse(content, out var template, out var errors))

Turns out that TryParse is actually an extension method on the Fluid.Core library which calls another extension method Parse here:

https://github.com/sebastienros/fluid/blob/575077f06517f99c95d8ecfcee13b805659673e2/Fluid/FluidParserExtensions.cs#L14

And returns the fluid template where RenderAsync is being called:

https://github.com/sebastienros/fluid/blob/0de3b07a5eeba650d69f19849fa62255fa1b4ca9/Fluid/Parser/FluidTemplate.cs#L20

From here I am lost. I still don't see any reference to BaseFluidTemplate but I would have guessed this FluidTemplate class was previously derived from BaseFluidTemplate and I confirmed that here in their 1.0 tag:

https://github.com/sebastienros/fluid/blob/b4400c4d8361709fdb235bfdfe01b6998327f1d3/Fluid/FluidTemplate.cs#L3

Sooooo.... I don't know what's goin on. Some sort of phantom reference?