Error during Installation

Hello, we are trying to install Navision 3.70 ourselves in our store in Tansania. Everything is fine, but then there is an error, which I cannot fix: When I want to work with a client not from the server pc, I get the message: “You cannot use the file (than the name of our database) because file is already in use” if I have already open navision on another pc. What is wrong with that? How can we work together in our database? Can somebody help me? thanks Fabian

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