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/CSharpClientCodegen.java:1269

    public void setSupportsDateOnly(Boolean supportsDateOnly) {
        this.supportsDateOnly = supportsDateOnly;
    }

    public void setUseIntForTimeout(Boolean useIntForTimeout) {
        this.useIntForTimeout = useIntForTimeout;
    }

    public void setThrowOnAnyError(Boolean throwOnAnyError) {
        this.throwOnAnyError = throwOnAnyError;
    }

    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 the 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# 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/ae07593a53840d8a. Report an issue: GitHub.