public static void main {  // Missing String[] args
    // ...
}

public static void createTwilioText() {
    Content.ContentCreateRequest createRequest = new Content.ContentCreateRequest("es", types); // types not yet declared
    
    Content.TwilioText twilioText = new Content.TwilioText();
    twilioText.setBody("text body");

    Content.Types types = new Content.Types(); // declared after use
    types.setTwilioText(twilioText);
    // ...
}

public static void main(String[] args) {  // Fixed method signature
    // ...
}

public static void createTwilioText() {
    Content.TwilioText twilioText = new Content.TwilioText();
    twilioText.setBody("text body");

    Content.Types types = new Content.Types(); // declared before use
    types.setTwilioText(twilioText);
    
    Content.ContentCreateRequest createRequest = new Content.ContentCreateRequest("es", types); // types now available
    // ...
}