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[please] problem with chinook database (SQL)

Screen Link:
https://app.dataquest.io/c/46/m/191/guided-project%3A-answering-business-questions-using-sql/1/introduction-and-schema-diagram

Hello everyone,

Now I am doing SQL project Answering Business Questions using SQL. After running some sql statements, I think I have reduced the size of Chinook.db, as I tried to run something like

%%sql
SELECT COUNT(*)
  FROM employee

The output:
image

So I tried to use a chinook-unmodified.db to copy over the chinook.db to restore it back to its initial state like the guidance suggested.

But when I try to run the very simple command !ls pwd. The engine returned:
image

I am using Window 10 Pro and using Anaconda Jupyter Notebook.

Any advice is appreciated and thank you in advance.