[BUG] Python: "Only the HandlebarsEngineAdapter is supported for this generator"

Created by: gtorrance-bw

I don't honestly know if this is a bug or something I am doing wrong, but would appreciate some help regardless.

I am trying to generate a Python client from an OpenAPI 3.0.1 file using the Maven plugin configured as follows. But when I do I get the error: "Only the HandlebarsEngineAdapter is supported for this generator". I am not specifying an Engine Adaptor, and I understand Handlebars is the default. What could be causing this? Thanks!

<plugin>
    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <version>6.2.1</version>
    <executions>
        <execution>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <inputSpec>${project.basedir}/target/openapi.json</inputSpec>
                <generatorName>python</generatorName>
                <configOptions>
                    <sourceFolder>src/gen/python/main</sourceFolder>
                </configOptions>
            </configuration>
        </execution>
    </executions>
</plugin>