Erro initializing DataTable visualizer - VS2019 - ASP.NET Oxygene

When debugging a web application ASP.NET with oxygene, an error occurs when trying to access the “DataTable Visualizer”.

When clicking on the magnifying glass, the error “Could not load the custom viewer” occurs, as shown in the image below.

This is an example project that reproduces de problem. (36.6 KB)

Thanx! I’ll have this looked at on Monday.


Hi Marc,

Have you analyzed the project?

My apologies; I’ll need to chase my colleague up on this.


When you will be able to analyze this problem? This week?


We loaded visualizer but unfortunately it can’t evaluate anything because of some problems with optimization which I have no idea where come from (

So we work on the problem and will let you know as soon as it is solved. Sorry for inconveniences.

OK, if you need any more info, let me know.

Hello Elenap,
What is the estimated deadline for analyzing this problem?


It turns out that Web application project has “Optimize = True” setting. That was the issue.

You can use Friday build and set Optimize to False and rebuild the project. Data Table visualizer should work.

Sorry for delay.

Best regards

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