Web server failed to start. Port 51601 was already in use.

当出现"Web server failed to start. Port 51601 was already in use."的错误提示时，这意味着端口51601已经被其他程序占用了，导致Web服务器无法启动。有几种方法可以解决这个问题。

首先，你可以尝试更换一个未被占用的端口。你可以在项目的配置文件或者IDEA的设置界面中找到端口号的设置，将其修改为一个未被占用的端口号，然后重新启动Web服务器。

如果端口51601被某个特殊情况所占用，比如IDEA闪退导致项目未停止，可以通过命令窗口停止这个程序。你可以打开命令窗口，输入相应的命令，找到占用端口51601的程序，并停止它，然后重新启动Web服务器。

总之，要解决"Web server failed to start. Port 51601 was already in use."的问题，你可以尝试更换一个未被占用的端口，或者通过命令窗口停止占用该端口的程序。这样就可以顺利启动Web服务器了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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