Printer resets when I click preheat all or preheat
Hello, i just installed repetier Server on Raspberry Pi and activated 14 days trial version. But whenever i try to preheat the printer (every time when I click) the printer resets itself and "Oops printer connection lost, trying to reconnect Server" error occurs in the screen, i want to buy a licence but i want to learn the program first. How can i solve this problem. I cant do anything heat-related. So i couldnt try the other functions due to this problem.