MCP 1.8.8执行decompile.sh时触发Python TypeError错误求助

API 探路者

2026-8-19

问题

尝试创建MCP工作区，运行decompile.sh生成文件时触发Python错误，错误堆栈如下：

Traceback (most recent call last):
  File "runtime/decompile.py", line 58, in decompile
    commands = Commands(conffile, verify=True, no_patch=no_patch, workdir=workdir, json=json)
  File "/Users/louie/Desktop/louie/mcp918/runtime/commands.py", line 176, in __init__
    normalStart = self.readconf(workdir, json)
  File "/Users/louie/Desktop/louie/mcp918/runtime/commands.py", line 565, in readconf
    self.mcLibraries = MinecraftDiscovery.getLibraries(mcDir, self.jsonFile, osKeyword)
  File "/Users/louie/Desktop/louie/mcp918/runtime/MinecraftDiscovery.py", line 157, in getLibraries
    libFilename = "%s-%s-%s.jar"%(libSubdir, libVersion, substitueString(library['natives'][osKeyword]))
  File "/Users/louie/Desktop/louie/mcp918/runtime/MinecraftDiscovery.py", line 185, in substitueString
    str = str.replace("${arch}", getArch())
TypeError: coercing to Unicode: need string or buffer, NoneType found
louie@Louies-MBP mcp918 %

操作系统为Mac，已安装Python 3和Java 8，寻求解决方法。

解决方案

切换到Python 2.7运行脚本：MCP 918仅适配Python 2.7，Python 3的类型系统会导致此类错误。
1. 通过Homebrew安装Python 2.7：brew install python@2
2. 终端中指定Python 2执行脚本：python2 runtime/decompile.py，或修改decompile.sh内的Python调用路径为python2
修改MinecraftDiscovery.py修复空值与架构兼容问题（若坚持用Python 3）：
1. 打开/Users/louie/Desktop/louie/mcp918/runtime/MinecraftDiscovery.py，找到substitueString函数，添加空值判断：
```
def substitueString(str):
    if str is None:
        return ""
    str = str.replace("${arch}", getArch())
    return str
```
2. 找到getArch()函数，修改为适配Mac架构的版本：
```
def getArch():
    import platform
    arch = platform.machine()
    return "arm64" if arch == "arm64" else "x86_64"
```
检查Minecraft版本JSON的natives配置：确认你使用的Minecraft版本JSON文件中，libraries条目里的natives.osx字段存在非空有效值，若缺失需补充对应native库的配置。