输入ddml crossfit后：Cross-fitting E[y|X] equation: ln化肥
Cross-fitting fold 1 Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'numpy'
(461 lines skipped)
(error occurred while loading pystacked.ado)
r(7102);




关于r7102的描述：
[P]     error . . . . . . . . . . . . . . . . . . . . . . . . Return code 7102
        a general error occurred while executing Python code
        This indicates a Python exception occurred while executing
        Python code in the interactive environment.  Check the Python
        error message for additional information.

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