ModuleNotFoundError：没有名为“错误”的模块

Question

为什么会出现此错误？我不记得安装过greenplum。

   File "C:\Generale\update.py", line 18, in <module>
        import yaml   
   File "C:\Program Files (x86)\Greenplum\greenplum-loaders-4.3.3.1-build-1\bin\lib\yaml\__init__.py", line 2, in <module>
        from error import *
   ModuleNotFoundError: No module named 'error'