OpenAPITools/openapi-generator · error · IllegalArgumentException

Invalid .NET framework version: {dotnetFramework}. List of s

Error message

Invalid .NET framework version: {dotnetFramework}. List of supported versions: {versions}

What it means

Error "Invalid .NET framework version: {dotnetFramework}. List of supported versions: {versions}" thrown in OpenAPITools/openapi-generator.

Source

Thrown at modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CSharpReducedClientCodegen.java:773

        this.packageName = packageName;
    }

    @Override
    public void setPackageVersion(String packageVersion) {
        this.packageVersion = packageVersion;
    }

    public void setSupportsAsync(Boolean supportsAsync) {
        this.supportsAsync = supportsAsync;
    }

    public void setSupportsRetry(Boolean supportsRetry) {
        this.supportsRetry = supportsRetry;
    }

    public void setTargetFramework(String dotnetFramework) {
        if (!frameworks.containsKey(dotnetFramework)) {
            throw new IllegalArgumentException("Invalid .NET framework version: " +
                    dotnetFramework + ". List of supported versions: " +
                    frameworkStrategies.stream()
                            .map(p -> p.name)
                            .collect(Collectors.joining(", ")));
        } else {
            this.targetFramework = dotnetFramework;
        }
        LOGGER.info("Generating code for .NET Framework {}", this.targetFramework);
    }

    public void setTargetFramework(List<FrameworkStrategy> strategies) {
        for (FrameworkStrategy strategy : strategies) {
            if (!frameworks.containsKey(strategy.name)) {
                throw new IllegalArgumentException("Invalid .NET framework version: " +
                        strategy.name + ". List of supported versions: " +
                        frameworkStrategies.stream()
                                .map(p -> p.name)
                                .collect(Collectors.joining(", ")));

View on GitHub (pinned to fcec517be3)

Solutions

1. Set targetFramework to one of the supported .NET framework versions listed in the message.

When it happens

Trigger: Thrown when the 'targetFramework' option for the C# reduced client generator is not a supported .NET framework version. Choose a version from the listed supported versions.

Common situations: See trigger scenarios.

AI-assisted analysis of OpenAPITools/openapi-generator@fcec517be3 (2026-08-22). Data as JSON: /api/errors/504f116446e6c771. Report an issue: GitHub.