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Example messages
error XA1044: The MSBuild property 'RunAOTCompilation' is not compatible with the CoreCLR runtime. The build cannot continue while this property is enabled. Either remove the property or guard it with a condition: Condition="'$(UseMonoRuntime)' == 'true'"
The condition suggested by this message is only appropriate for targets that
support Mono. In .NET 11, $(UseMonoRuntime)=true is rejected with
NETSDK1242; remove the Mono-only
property instead.
Issue
This error indicates that a Mono-specific MSBuild property is set in
the project file, but the project is configured to use a non-Mono
runtime, such as CoreCLR or NativeAOT. The build resets the property to
false so it is not passed to non-Mono build steps, then stops with
XA1044. This is not a warning or a silent no-op.
Properties that trigger this error include:
RunAOTCompilation— Enables Mono AOT compilation.EnableLLVM— Enables LLVM for the Mono AOT compiler.
Solution
Remove the Mono-specific property from your project file or
Directory.Build.props. Retain it only in project files or conditions
that apply exclusively to supported .NET 10-and-earlier Mono targets.
ReadyToRun and NativeAOT are separate compilation models. They are not one-to-one replacements for Mono AOT settings.