Google Translation:

Please help me fix an error that occurred during the code upload process, preventing me from accessing the admin panel and only allowing me to access the main website.

I think you’re misunderstanding things here.

We don’t actually run your site or have any form of control over it in any way. So *you* must fix/resolve your problem, because nobody here can do anything to your site, in any way whatsoever. Hence, You need to resolve this issue with your developer.

If you want to try “real time” conversation, jump into the WordPress IRC channel. https://make.wordpress.org/support/irc-support-channel/

If you can’t do the work yourself, you have the option of engaging a professional to assist you. If you want to follow that option and hire someone for this, then please try http://jobs.wordpress.net/ and do not accept any hire or direct access offers posted to these forums.