Could not start web server on host %1, port %2: %3

Cause

• A second instance of the program is running
• The given port is already in use;
• A firewall or antivirus is blocking the programm to open the port.
• The system is not correctly configured;

Solutions

• Check the details at the end of the error message;
• Verify that only one instance of the program is running;
• Change the used port in web server setting file;
• In the antivirus or firewall application allow the program to open the given port;
• Reinstall the programm.