修复缓存，修复login时错误无法显示的bug

loginFunctions.py

@@ -10,8 +10,9 @@ from codiaclient.network import _acquire_verification as _AcquireVerification
 from codiaclient.report import Error as codiaError, error_translate
 from codiaclient.utils import cookie_decrypt as Decrypt, cookie_encrypt as Encrypt
 from codiaclient.cachectrl import variables as cache_var
-from codiaclientgui.utils import Font, Style
+from codiaclientgui.utils import Font, Style, ErrorDisplay
 
+from os import path
 sessionPath = path.join(cache_var['appDataPath'], ".gui.cache")
 
 # 初始化任务，新建一个登录窗体和对应的ui