Web server failed to start. Port 8761 was already in use.

It seems like the port 8761 is already in use, which is causing the web server to fail to start. To resolve this issue, you can try the following steps:

1. Identify the process using port 8761:
- On Linux/Mac: Open a terminal and use the command `lsof -i :8761` to list the processes using that port.
- On Windows: Open Command Prompt and use the command `netstat -ano | findstr :8761` to find the process ID (PID) using that port.

2. Stop the process using port 8761:
- On Linux/Mac: Use the command `kill <PID>` to stop the process identified in step 1.
- On Windows: Use the command `taskkill /PID <PID> /F` to forcefully terminate the process identified in step 1.

3. Restart the web server:
- Try starting the web server again and see if it successfully starts on port 8761.

If port 8761 is still in use, you can consider changing the port number in your web server's configuration file to an available port.