I found that the problem exist some time and not solved yet:
AVG Community
Hello Dmitry, Thank you for taking the time to write back. My name is Shawn, and I am writing to you on behalf of AVG's senior support team.
I understand you previously communicated with my colleague, Andre by email, however the disruption you are experiencing has not resolved.
Given you are a software developer, to help point you in the right direction, the following AVG support article, https://is.gd/JStVFD, provides AVG whitelisting information for software developers to reduce the risk of false positive detections.
I trust this information to be helpful. Let me know if there is anything else I may help you with. Regards, Shawn
The same error.
Hi Dmitry.
Sorry to hear that. Please visit https://www.avg.com/en-ww/false-positive-file-form and try to submit the false detection report.
The same error.
We understand your concern, Dmitry. The website seems to be unavailable at few regions currently. The concerned team is already aware of it. We are continuously extending and improving our support for all the languages, Please accept our apologies for the inconvenience caused.
This is what I want: someone who can really help.
We apologize for the inconvenience caused, Dmitry
I request you to change the language to UK English or other languages and try submitting again.
Let us know if you are still getting the same error.
This isn't the experience we want you to have, Dmitry. To further investigate on this, we may need to forward this to our senior team. Please wait for an email from them. Thank you for your understanding in advance!