import requests

def paste_to_centos(text, title=None, name=None, private=False, lang=None, expire=None):
    """
    Paste text to paste.centos.org and return the URL of the created paste.
    
    :param text: The content to paste (required)
    :param title: Title for the paste (optional)
    :param name: Author's name (optional)
    :param private: Make paste private if True (optional)
    :param lang: Language for syntax highlighting (optional)
    :param expire: Expiration time in minutes (optional)
    :return: URL of the created paste or error message
    """
    url = "https://paste.centos.org/api/create"
    
    data = {
        "text": text
    }
    
    if title:
        data["title"] = title
    if name:
        data["name"] = name
    if private:
        data["private"] = 1
    if lang:
        data["lang"] = lang
    if expire:
        data["expire"] = expire
    
    response = requests.post(url, data=data)
    
    if response.status_code == 200:
        return response.text.strip()  # Return the paste URL
    else:
        return f"Error: {response.text.strip()}"

# Example usage:
# result = paste_to_centos("This is a test paste", title="Test", name="John Doe", lang="python")
# print(result)