你好，需要帮助。我不明白为什么会出现这个错误。有一个从 IPS4 导入的脚本，启动后只给出了这样的错误。
摘要
正在加载现有群组…
正在加载现有用户…
正在加载现有分类…
正在加载现有帖子…
正在加载现有主题…
正在创建用户
正在导入分类…
13 / 41 ( 31.7%) [189062 项/分钟] 回溯（最近一次调用在最后）：
7: 来自 script/import_scripts/ipb4.rb:432:in \u003cmain\u003e' 6: 来自 /var/www/discourse/script/import_scripts/base.rb:47:in perform’
5: 来自 script/import_scripts/ipb4.rb:43:in execute' 4: 来自 script/import_scripts/ipb4.rb:171:in import_categories’
3: 来自 /var/www/discourse/script/import_scripts/base.rb:416:in create_categories' 2: 来自 /var/www/discourse/script/import_scripts/base.rb:416:in each’
1: 来自 /var/www/discourse/script/import_scripts/base.rb:425:in block in create_categories' /var/www/discourse/script/import_scripts/base.rb:425:in strip!': 无法修改冻结的字符串：“Blank” (FrozenError)
root@ff-perm-app:/var/www/discourse# vi /var/www/discourse/script/import_scripts/ipb4.rb
摘要
{
id: category['id'],
name: CGI.unescapeHTML(category['name_seo']).gsub('-', ' ').capitalize,
description: ''
}