1. No possibility to log in
During logging in it is necessary to enter correct ID and password. During entering ID and password size of letters is important. Thus it is necessary to make sure if the size of entered letters is correct.
2. Displaying message about lack of communication with the server
During operation of the program there is a possibility of displaying the message about lack of communication with the server and with the question whether to try to establish connection again; it can be related with modernisation works at the server or a problem with the connection itself. If it is not possible to establish connection again at once, it is necessary to close the program and start it once again in a few minutes.
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