that site is not loading. instead give your forum url
getting a blank page for the new thread. disable all plugins (setting available at general configuration) and check it
@giangtpt
Please give us picture of error and make sure that picture can be loaded.
Alternatively you may copy-paste error and paste here as quote or code block.
Previous pictures cannot be seen,
Login to your site also not helps because it give blank page when error.
^ so what was causing the problem ?