英雄联盟LOL出现错误代码900是因为软件冲突导致系统删除了游戏文件，可以用以下方法修复，步骤如下：
需要工具：电脑、腾讯游戏平台
一、打开腾讯游戏平台并登录账号。
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二、找到下方的工具一栏并打开
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三、打开游戏管理选项
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四、点击游戏修复工具对游戏进行修复
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五、之后点击检测游戏出现如下页面
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六、游戏出现了一些基本文件损坏，可以通过这个方法对游戏进行修复的，点击一键修复。
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七、提示修复完毕后，即可正常进入游戏。
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