Answer: As the conventional etiquette, which lays out rules of ethics in social contexts, the purpose of netiquette is to help create and sustain a friendly, relaxed and productive atmosphere for online contact, as well as to avoid putting pressure on the system and creating tension between users.
The most likely reason for this error is that the share is currently not available either on just the user’s computer or server-wide. The next step would be to check for the scope of the problem.