I have installed 1C Enerprise 8.3 and Accounting 2.0 configuration. Web client gives an error like this:
{"#exception":"{http://v8.1c.ru/8.2/virtual-resource-system}Exception","exception":{"clsid":"580392e6-ba49-4280-ac67-fcd6f2180121","reason":405,"descr":"HTTP: Method not allowed\nError executing the query GET to resource /e1cib/login:"}}.

Any help would be appreciated.

Addition.
Here is the url of the error:
http://localhost/InfoBase1/en_US/e1cib/login?version=8.3.3.658&cred=Og==&nooida&vl=en_US&clnId=72e2d40c-45c8-7097-5dbf-8d58f89e1cb5

This application is not published on 1C:Developer Network, thus we can't support it. Try to set compatibility mode to 8.2 in configuration parameters.