human
Solve the following python programming problem given the following code:
def render_admin_panel(self, req, category, page, path_info) : 
    req.perm.require ('VERSIONCONTROL_ADMIN') 
    if (req.method == 'POST') : 
        perms = { 
            
} 
        for setting in req.args : 
            try : 
                setting = json.loads (setting) 
except ValueError : 
                continue 
if ((not isinstance (setting, dict)) or ('perm' not in setting) or ('user' not in setting) or ('repo' not in setting)) : 
                continue 
repo = setting ['repo'] 
            perm = setting ['perm'] 
            user = setting ['user'] 
            if (repo not in perms) : 
                perms [repo] = { 
                    
} 
if (perm not in perms [repo]) : 
                perms [repo] [perm] = [] 
if (user not in perms [repo] [perm]) : 
                perms [repo] [perm].append (user) 
gitolite_admin_perms = perms.get (self.gitolite_admin_real_reponame, { 
            
}) 
        if ((self.gitolite_admin_system_user not in gitolite_admin_perms.get ('R', [])) or (self.gitolite_admin_system_user not in gitolite_admin_perms.get ('W', []))) : 
            add_warning (req, _ (('Read and write permissions on the gitolite admin repo must not be revoked for user %s -- otherwise this plugin will no longer work!' % flattened_perms.gitolite_admin_system_user))) 
            req.redirect (req.href.admin (category, page)) 
utils.save_file (self.gitolite_admin_ssh_path, 'conf/gitolite.conf', utils.to_string (perms), _ ('Updating repository permissions')) 
        add_notice (req, _ ('The permissions have been updated.')) 
        req.redirect (req.href.admin (category, page)) 
perms = self.read_config () 
    users_listed_in_perms = set () 
    flattened_perms = set () 
    for p in perms.values () : 
        for perm in p : 
            flattened_perms.add (perm) 
            users_listed_in_perms.update (p [perm]) 
flattened_perms = list (flattened_perms) 
    def sort_perms(perms) : 
        tail = [] 
        if ('+' in perms) : 
            perms.remove ('+') 
           ...

    
    

    Fix the buggy line: add_warning (req, _ (('Read and write permissions on the gitolite admin repo must not be revoked for user %s -- otherwise this plugin will no longer work!' % flattened_perms.gitolite_admin_system_user)))
assistant
#Here is Python program to fix the buggy line: add_warning (req, _ (('Read and write permissions on the gitolite admin repo must not be revoked for user %s -- otherwise this plugin will no longer work!' % flattened_perms.

add_warning (req, _ (('Read and write permissions on the gitolite admin repo must not be revoked for user %s -- otherwise this plugin will no longer work!' % self.gitolite_admin_system_user)))