这是什么意思

Object of type MobileElement is not JSON serializable
Traceback (most recent call last):
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.12.31\python\lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.12.31\python\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.12.31\python\lib\site-packages\xbot_interpreter.py", line 87, in <module>
main()
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.12.31\python\lib\site-packages\xbot_interpreter.py", line 47, in main
try:
File "C:\Users\Administrator\AppData\Local\ShadowBot\users\55b6ad3e-4380-4891-bb5b-7c838c0da41d\apps\b3b50f1c-5d52-4717-8875-77916088b066\xbot_robot\process48.py", line 12, in main
xbot_visual.programing.databook.write_data_to_workbook(write_range="column", write_way="append", write_column_way="override", row_num="1", column_name="1", begin_row_num=databook_row_count, begin_column_name="", content=mobile_element_list, _block=("子流程23", 4, "写入内容至数据表格"))
File "<string>", line 89, in wrapper
File "<string>", line 84, in wrapper
File "<string>", line 165, in write_data_to_workbook
File "<string>", line 100, in set_column
File "<string>", line 24, in execute
File "<string>", line 54, in _send_request
File "<string>", line 21, in write
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.12.31\python\lib\json\__init__.py", line 231, in dumps
return _default_encoder.encode(obj)
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.12.31\python\lib\json\encoder.py", line 199, in encode
chunks = self.iterencode(o, _one_shot=True)
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.12.31\python\lib\json\encoder.py", line 257, in iterencode
return _iterencode(o, 0)
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.12.31\python\lib\json\encoder.py", line 179, in default
raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type MobileElement is not JSON serializable