Hello,
My issue was resolved. There is the reason by NameCheap.com
Hello,
The reason of the issue is the ModSecurity block.
ModSecurity is an Apache module that works as a web application firewall. It blocks known exploits and provides protection from a range of attacks against web applications. However, sometimes, mod_security may incorrectly determine that a certain request is malicious while it is actually legitimate. In such a situation, we can whitelist the triggered mod_security rule on the server so that you can bypass the block.
We have whitelisted the triggered rules.
Please retry your actions and let us know if there are any issues.
_______________
Best Regards,
Yehor Lemberskyi,
Namecheap Customer Support,