Given the exception stack trace, looks like the graphics subsystem is not properly initialized. When deserializing and instantiating the report, some of its properties try to initialize the graphics engine in order to determine some basic metrics like machine's DPI.

Since you run your report on AWS, by default Telerik Reporting will use Skia graphics engine, which requires installing the Telerik.Drawing.Skia NuGet package. Additionally, two other libraries must be installed:

• sudo apt-get install -y libfreetype6
• sudo apt-get install -y libfontconfig1

Check the help article for more info: https://docs.telerik.com/reporting/getting-started/installation/dot-net-core-support#deploying-on-linux