Error when running colab

I am running the colab code in local using python 3.8.18, and it seems like I have successfully downloaded all the package, but when I run "agent.query_db("how many deaths of age below 40 had stomach cancer?")", it shows this error. Strangely, I can run this line "agent.get_query("how many deaths of age below 40 had stomach cancer?")"
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TypeError Traceback (most recent call last)
[c:\Users\super\OneDrive\Desktop\research\tableQA.ipynb](file:///C:/Users/super/OneDrive/Desktop/research/tableQA.ipynb) Cell 5 line 1
----> [1](vscode-notebook-cell:/c%3A/Users/super/OneDrive/Desktop/research/tableQA.ipynb#W4sZmlsZQ%3D%3D?line=0) agent.query_db("how many deaths of age below 40 had stomach cancer?")

File [c:\Users\super\anaconda3\envs\nextgpt\lib\site-packages\tableqa\agent.py:72](file:///C:/Users/super/anaconda3/envs/nextgpt/lib/site-packages/tableqa/agent.py:72), in Agent.query_db(self, question, verbose, chart, size)
70 database = Database(self.data_dir, self.schema_dir)
71 create_db = getattr(database, self.db_type)
---> 72 engine = create_db(question)
73 answer = engine.execute(query).fetchall()
74 if chart is not None:

File [c:\Users\super\anaconda3\envs\nextgpt\lib\site-packages\tableqa\database.py:26](file:///C:/Users/super/anaconda3/envs/nextgpt/lib/site-packages/tableqa/database.py:26), in Database.sqlite(self, question)
24 data_frame=self.data_process.get_dataframe(csv).astype(str)
25 schema=self.data_process.get_schema_for_csv(csv)
---> 26 data_frame = data_frame.fillna(data_frame.mean())
27 sql_schema = {}
28 for col in schema['columns']:

File [c:\Users\super\anaconda3\envs\nextgpt\lib\site-packages\pandas\core\generic.py:11556](file:///C:/Users/super/anaconda3/envs/nextgpt/lib/site-packages/pandas/core/generic.py:11556), in NDFrame._add_numeric_operations..mean(self, axis, skipna, numeric_only, **kwargs)
11539 @doc(
11540 _num_doc,
11541 desc="Return the mean of the values over the requested axis.",
(...)
11554 **kwargs,
...
46 def _sum(a, axis=None, dtype=None, out=None, keepdims=False,
47 initial=_NoValue, where=True):
---> 48 return umr_sum(a, axis, dtype, out, keepdims, initial, where)

TypeError: can only concatenate str (not "int") to str